SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS - Allowance for Doubtful Accounts (Details) (Allowance for Doubtful Accounts, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 704	$ 541	$ 684
Charged (Credited) to Income	0	163	(143)
Deduction and Other	(35)	0	0
Balance at End of Year	$ 669	$ 704	$ 541