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SCHEDULE V Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Doubtful Accounts Receivable      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 794 $ 2,760 $ 2,476
Charged to Costs and Expenses 2,862 99 403
Deductions (37) (2,065) (119)
Other 0 0 0
Balance at End of Period 3,619 794 2,760
Deferred Tax Asset Valuation      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 68,104 68,983 118,323
Charged to Costs and Expenses 57,830 (879) (49,340)
Deductions 0 0 0
Other 12,110 0 0
Balance at End of Period $ 138,044 $ 68,104 $ 68,983