Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidating Financial Information (Condensed Consolidating Statements of Comprehensive Income (Loss)) (Details)

v3.7.0.1
Condensed Consolidating Financial Information (Condensed Consolidating Statements of Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Condensed Financial Statements, Captions [Line Items]        
Net income (loss) $ 105,936 $ (339,776) $ 260,391 $ (582,043)
Foreign currency translation adjustment 4,514 (684) 5,887 8,374
Other comprehensive income (loss) 4,514 (684) 5,887 8,374
Comprehensive income (loss) 110,450 (340,460) 266,278 (573,669)
Reportable Legal Entities | Parent        
Condensed Financial Statements, Captions [Line Items]        
Net income (loss) 105,936 (339,776) 260,391 (582,043)
Foreign currency translation adjustment 4,514 (684) 5,887 8,374
Other comprehensive income (loss) 4,514 (684) 5,887 8,374
Comprehensive income (loss) 110,450 (340,460) 266,278 (573,669)
Reportable Legal Entities | Guarantors        
Condensed Financial Statements, Captions [Line Items]        
Net income (loss) 53,860 55 99,741 21
Foreign currency translation adjustment 19 0 74 0
Other comprehensive income (loss) 19 0 74 0
Comprehensive income (loss) 53,879 55 99,815 21
Reportable Legal Entities | Non-Guarantor        
Condensed Financial Statements, Captions [Line Items]        
Net income (loss) (209) (762) (575) (24,449)
Foreign currency translation adjustment 4,495 (604) 5,813 9,669
Other comprehensive income (loss) 4,495 (604) 5,813 9,669
Comprehensive income (loss) 4,286 (1,366) 5,238 (14,780)
Eliminations        
Condensed Financial Statements, Captions [Line Items]        
Net income (loss) (53,651) 707 (99,166) 24,428
Foreign currency translation adjustment (4,514) 604 (5,887) (9,669)
Other comprehensive income (loss) (4,514) 604 (5,887) (9,669)
Comprehensive income (loss) $ (58,165) $ 1,311 $ (105,053) $ 14,759