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
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities $ 138,874 $ 201,509
Net cash (used in) provided by investing activities (979,766) (624,760)
Net cash provided by (used in) financing activities 1,224,040 39,588
Net increase (decrease) in cash and cash equivalents 383,148 (383,663)
Cash and cash equivalents at beginning of period 142,340 458,956
Cash and cash equivalents at end of period 525,488 75,293
Parent [Member]    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 135,485 203,057
Net cash (used in) provided by investing activities (976,820) (621,155)
Net cash provided by (used in) financing activities 1,224,040 39,588
Net increase (decrease) in cash and cash equivalents 382,705 (378,510)
Cash and cash equivalents at beginning of period 141,535 451,431
Cash and cash equivalents at end of period 524,240 72,921
Guarantors [Member]    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 3,389 (1,546)
Net cash (used in) provided by investing activities (2,946) (3,608)
Net cash provided by (used in) financing activities 0 0
Net increase (decrease) in cash and cash equivalents 443 (5,154)
Cash and cash equivalents at beginning of period 804 7,525
Cash and cash equivalents at end of period 1,247 2,371
Non-Guarantor [Member]    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities (1) (2)
Net cash (used in) provided by investing activities (8,267) (16,569)
Net cash provided by (used in) financing activities 8,268 16,572
Net increase (decrease) in cash and cash equivalents 0 1
Cash and cash equivalents at beginning of period 1 0
Cash and cash equivalents at end of period 1 1
Eliminations [Member]    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 1 0
Net cash (used in) provided by investing activities 8,267 16,572
Net cash provided by (used in) financing activities (8,268) (16,572)
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