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Schedule II-Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Valuation and Qualifying Accounts      
Balance at Beginning of Period $ 35,640 $ 10,191 $ 5,200
Charged (Credited) to coasts and Expenses 23,698 25,342 4,366
Charged to Other Accounts (2,291) 325 625
Deductions (568) (218)  
Balance at End of Period 56,479 35,640 10,191
Allowance for doubtful accounts      
Valuation and Qualifying Accounts      
Balance at Beginning of Period 731 2,438 492
Charged (Credited) to coasts and Expenses 43 (1,814) 1,946
Charged to Other Accounts   325  
Deductions (568) (218)  
Balance at End of Period 206 731 2,438
Valuation allowance in net deferred tax assets      
Valuation and Qualifying Accounts      
Balance at Beginning of Period 34,909 7,753 4,708
Charged (Credited) to coasts and Expenses 23,655 27,156 2,420
Charged to Other Accounts (2,291)   625
Balance at End of Period $ 56,273 $ 34,909 $ 7,753