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Schedule II - Valuation and Qualifying Account (Details) - Allowance for doubtful accounts - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 2,528 $ 2,477 $ 13,614
Additions/Charged to Expense 10,374 570 1,062
Deductions (761) (751) (10,497)
Other 2,196 232 (1,702)
Balance at end of period $ 14,337 $ 2,528 $ 2,477