Schedule of 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		$ 291	$ 2,513	$ 2,749
Charged to Expenses or Other Accounts, Net		547	97	944
Deductions and Adjustments	[1]	(474)	(2,319)	(1,180)
Balance at End of Year		$ 364	$ 291	$ 2,513

[1] Deductions and adjustments for the allowances primarily relate to accounts written off.