SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS [Schedule] (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 986	$ 1,108	$ 1,174
Additions Charged to Costs/Expenses (Recoveries)	178	97	(13)
Deductions	304	219	53
Balance at End of Period	860	986	1,108
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	158,851	162,278	154,329
Additions Charged to Costs/Expenses (Recoveries)	3,488	243	8,225
Deductions	3,041	3,670	276
Balance at End of Period	$ 159,298	$ 158,851	$ 162,278