Annual report pursuant to Section 13 and 15(d)

Condensed Consolidating Financial Information - Condensed Consolidating Statement of Cash Flows (Details)

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Condensed Consolidating Financial Information - Condensed Consolidating Statement of Cash Flows (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities $ 191,065 $ 199,158 $ 158,138
Net cash provided by (used in) investing activities (664,260) (840,579) (323,248)
Net cash provided by (used in) financing activities 765,063 714,612 256,539
Net increase in cash and cash equivalents 291,868 73,191 91,429
Cash and cash equivalents at beginning of period 167,088 93,897 2,468
Cash and cash equivalents at end of period 458,956 167,088 93,897
Parent [Member]
      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities 182,961 195,734 154,329
Net cash provided by (used in) investing activities (661,886) (838,177) (320,203)
Net cash provided by (used in) financing activities 765,063 714,612 256,539
Net increase in cash and cash equivalents 286,138 72,169 90,665
Cash and cash equivalents at beginning of period 165,293 93,124 2,459
Cash and cash equivalents at end of period 451,431 165,293 93,124
Guarantor [Member]
      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities 8,104 3,425 3,808
Net cash provided by (used in) investing activities (2,374) (2,402) (3,045)
Net cash provided by (used in) financing activities 0 0 0
Net increase in cash and cash equivalents 5,730 1,023 763
Cash and cash equivalents at beginning of period 1,795 772 9
Cash and cash equivalents at end of period 7,525 1,795 772
Non-Guarantor [Member]
      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities 0 (1) 1
Net cash provided by (used in) investing activities (33,929) (103,915) (25,858)
Net cash provided by (used in) financing activities 33,929 103,915 25,858
Net increase in cash and cash equivalents 0 (1) 1
Cash and cash equivalents at beginning of period 0 1 0
Cash and cash equivalents at end of period 0 0 1
Eliminations [Member]
      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities 0 0 0
Net cash provided by (used in) investing activities 33,929 103,915 25,858
Net cash provided by (used in) financing activities (33,929) (103,915) (25,858)
Net increase in cash and cash equivalents 0 0 0
Cash and cash equivalents at beginning of period 0 0 0
Cash and cash equivalents at end of period $ 0 $ 0 $ 0