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, 2014
Jun. 30, 2013
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities $ 201,509 $ 73,545
Net cash provided by (used in) investing activities (624,760) (384,529)
Net cash provided by (used in) financing activities 39,588 358,281
Net (decrease) increase in cash and cash equivalents (383,663) 47,297
Cash and cash equivalents at beginning of period 458,956 167,088
Cash and cash equivalents at end of period 75,293 214,385
Parent Company [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 203,057 73,633
Net cash provided by (used in) investing activities (621,155) (383,817)
Net cash provided by (used in) financing activities 39,588 358,281
Net (decrease) increase in cash and cash equivalents (378,510) 48,097
Cash and cash equivalents at beginning of period 451,431 165,293
Cash and cash equivalents at end of period 72,921 213,390
Guarantor [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities (1,546) (88)
Net cash provided by (used in) investing activities (3,608) (712)
Net cash provided by (used in) financing activities 0 0
Net (decrease) increase in cash and cash equivalents (5,154) (800)
Cash and cash equivalents at beginning of period 7,525 1,795
Cash and cash equivalents at end of period 2,371 995
Non-Guarantor [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities (2) 0
Net cash provided by (used in) investing activities (16,569) (15,055)
Net cash provided by (used in) financing activities 16,572 15,055
Net (decrease) increase in cash and cash equivalents 1 0
Cash and cash equivalents at beginning of period 0 0
Cash and cash equivalents at end of period 1 0
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 16,572 15,055
Net cash provided by (used in) financing activities (16,572) (15,055)
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