Quarterly report pursuant to Section 13 or 15(d)

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

v3.10.0.1
Condensed Consolidating Financial Information (Condensed Consolidating Statements of Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Condensed Financial Statements, Captions [Line Items]        
Net income (loss) $ 111,319 $ 105,936 $ 201,409 $ 260,391
Foreign currency translation adjustment (3,364) 4,514 (8,867) 5,887
Other comprehensive (loss) income (3,364) 4,514 (8,867) 5,887
Comprehensive income 107,955 110,450 192,542 266,278
Reportable Legal Entities | Parent        
Condensed Financial Statements, Captions [Line Items]        
Net income (loss) 111,319 105,936 201,409 260,391
Foreign currency translation adjustment (3,364) 4,514 (8,867) 5,887
Other comprehensive (loss) income (3,364) 4,514 (8,867) 5,887
Comprehensive income 107,955 110,450 192,542 266,278
Reportable Legal Entities | Guarantors        
Condensed Financial Statements, Captions [Line Items]        
Net income (loss) 176,350 53,860 263,036 99,741
Foreign currency translation adjustment 14 19 (173) 74
Other comprehensive (loss) income 14 19 (173) 74
Comprehensive income 176,364 53,879 262,863 99,815
Reportable Legal Entities | Non-Guarantor        
Condensed Financial Statements, Captions [Line Items]        
Net income (loss) (229) (209) (560) (575)
Foreign currency translation adjustment (3,378) 4,495 (8,694) 5,813
Other comprehensive (loss) income (3,378) 4,495 (8,694) 5,813
Comprehensive income (3,607) 4,286 (9,254) 5,238
Eliminations        
Condensed Financial Statements, Captions [Line Items]        
Net income (loss) (176,121) (53,651) (262,476) (99,166)
Foreign currency translation adjustment 3,364 (4,514) 8,867 (5,887)
Other comprehensive (loss) income 3,364 (4,514) 8,867 (5,887)
Comprehensive income $ (172,757) $ (58,165) $ (253,609) $ (105,053)