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Business and Basis of Presentation (Impact of Adopting ASC 606) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Apr. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                        
Total revenues                 $ 975,777      
Total operating expenses $ 291,695 $ 61,694 $ 66,548 $ 68,136 $ 164,353 $ 63,784 $ 68,373 $ 64,521 488,073 $ 361,031 $ 294,643  
Loss before income taxes (179,030) 50,996 43,519 46,460 (52,562) 57,639 49,321 52,688 (38,055) 107,086 110,850  
Provision (benefit) for income taxes (39,756) 12,829 12,678 11,994 (12,875) (257,154) 18,616 18,929 (2,255) (232,484) 41,455  
Net income (139,274) $ 38,167 $ 30,841 $ 34,466 (39,687) $ 314,793 $ 30,705 $ 33,759 (35,800) 339,570 $ 69,395  
Accounts receivable, net 148,787       140,881       148,787 140,881    
Inventories 119,880       118,547       119,880 118,547    
Other accrued liabilities 60,663       52,101       60,663 52,101    
Deferred income tax liabilities 399,575       442,518       399,575 442,518    
Retained earnings $ 701,820       736,277       701,820 736,277    
ASC 606                        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                        
Accounts receivable, net                       $ 146,319
Inventories                       116,779
Other accrued liabilities                       54,027
Deferred income tax liabilities                       442,919
Retained earnings                       737,620
Impact of Change | ASC 606                        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                        
Total revenues                 (14,756)      
Cost of sales                 (5,220)      
Total operating expenses                 (319)      
Loss before income taxes                 (9,217)      
Provision (benefit) for income taxes                 (2,662)      
Net income                 (6,555)      
Accounts receivable, net                       5,438
Inventories                       (1,768)
Other accrued liabilities                       1,926
Deferred income tax liabilities                       401
Retained earnings                       $ 1,343
Without Adoption of ASC 606                        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                        
Total revenues                 961,021      
Cost of sales                 414,981      
Total operating expenses                 487,754      
Loss before income taxes                 (47,272)      
Provision (benefit) for income taxes                 (4,917)      
Net income                 $ (42,355)      
Without Adoption of ASC 606 | ASC 606                        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                        
Accounts receivable, net         140,881         140,881    
Inventories         118,547         118,547    
Other accrued liabilities         52,101         52,101    
Deferred income tax liabilities         442,518         442,518    
Retained earnings         $ 736,277         $ 736,277