SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 669	$ 704	$ 541
Charged (Credited) to Income	3	0	163
Deduction and Other	0	(35)	0
Balance at End of Year	672	669	704
Deferred Tax Asset Valuation Allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	176,786	181,499	175,300
Charged (Credited) to Income	0	0	6,199
Deduction and Other	(3,705)	(4,713)	0
Balance at End of Year	$ 173,081	$ 176,786	$ 181,499