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
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities $ 156,150 $ 35,007
Net cash provided by (used in) investing activities (445,112) (333,216)
Net cash provided by (used in) financing activities 388 357,101
Net (decrease) increase in cash and cash equivalents (288,574) 58,892
Cash and cash equivalents at beginning of period 458,956 167,088
Cash and cash equivalents at end of period 170,382 225,980
Parent [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 159,736 35,682
Net cash provided by (used in) investing activities (443,079) (332,807)
Net cash provided by (used in) financing activities 388 357,101
Net (decrease) increase in cash and cash equivalents (282,955) 59,976
Cash and cash equivalents at beginning of period 451,431 165,293
Cash and cash equivalents at end of period 168,476 225,269
Guarantor [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities (3,585) (675)
Net cash provided by (used in) investing activities (2,034) (410)
Net cash provided by (used in) financing activities 0 0
Net (decrease) increase in cash and cash equivalents (5,619) (1,085)
Cash and cash equivalents at beginning of period 7,525 1,795
Cash and cash equivalents at end of period 1,906 710
Non-Guarantor [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities (1) 0
Net cash provided by (used in) investing activities (8,069) (7,529)
Net cash provided by (used in) financing activities 8,070 7,530
Net (decrease) increase in cash and cash equivalents 0 1
Cash and cash equivalents at beginning of period 0 0
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 8,070 7,530
Net cash provided by (used in) financing activities (8,070) (7,530)
Net (decrease) increase 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