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Schedule II - Valuation and Qualifying Accounts - Summary of Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for Doubtful Accounts [Member]      
Balance at Beginning of Period $ 1,299 $ 1,348 $ 1,519
Additions Charged to Costs and Expenses 369 506 467
Additions Charged to Other Accounts
Deductions (283) (555) (638)
Balance at End of Period 1,385 1,299 1,348
Valuation Allowance of Deferred Tax Assets [Member]      
Balance at Beginning of Period 1,030 1,381 1,298
Additions Charged to Costs and Expenses 987 83
Additions Charged to Other Accounts
Deductions (351)
Balance at End of Period $ 2,017 $ 1,030 $ 1,381