SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS [Schedule] (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 860	$ 986	$ 1,108
Additions Charged to Costs/Expenses (Recoveries)	226	178	97
Deductions	287	304	219
Balance at End of Period	799	860	986
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	159,298	158,851	162,278
Additions Charged to Costs/Expenses (Recoveries)	(5,045)	447	(3,427)
Deductions	(2,089)	0	0
Balance at End of Period	$ 156,342	$ 159,298	$ 158,851