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Schedule II - Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance At Beginning of Year $ 1,847 $ 715 $ 923
Additions Charged Against Operations 1,298 2,006 (448)
Uncollectible Accounts Written-Off (108) (874) 240
Balance at End of Year $ 3,037 $ 1,847 $ 715