Quarterly report pursuant to Section 13 or 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
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities $ 73,545 $ 99,497
Net cash provided by (used in) investing activities (384,529) (254,266)
Net cash provided by (used in) financing activities 358,281 67,485
Net increase (decrease) in cash and cash equivalents 47,297 (87,284)
Cash and cash equivalents at beginning of period 167,088 93,897
Cash and cash equivalents at end of period 214,385 6,613
Parent [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 73,633 98,827
Net cash provided by (used in) investing activities (383,817) (253,175)
Net cash provided by (used in) financing activities 358,281 67,485
Net increase (decrease) in cash and cash equivalents 48,097 (86,863)
Cash and cash equivalents at beginning of period 165,293 93,124
Cash and cash equivalents at end of period 213,390 6,261
Guarantor [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities (88) 670
Net cash provided by (used in) investing activities (712) (1,091)
Net cash provided by (used in) financing activities 0 0
Net increase (decrease) in cash and cash equivalents (800) (421)
Cash and cash equivalents at beginning of period 1,795 772
Cash and cash equivalents at end of period 995 351
Non-Guarantor [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 0 0
Net cash provided by (used in) investing activities (15,055) (78,312)
Net cash provided by (used in) financing activities 15,055 78,312
Net increase (decrease) in cash and cash equivalents 0 0
Cash and cash equivalents at beginning of period 0 1
Cash and cash equivalents at end of period 0 1
Eliminations [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 0 0
Net cash provided by (used in) investing activities 15,055 78,312
Net cash provided by (used in) financing activities (15,055) (78,312)
Net increase (decrease) in cash and cash equivalents 0 0
Cash and cash equivalents at beginning of period 0 0
Cash and cash equivalents at end of period $ 0 $ 0