Schedule II - Valuation and Qualifying Accounts (Details) - Valuation and Qualifying Accounts (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts [Member]
Valuation Allowance [Line Items]
Balance at Beginning of Period	$ 730	$ 2,064	$ 2,314
Charged to Costs and Expenses	1,356	432	140
Charged to Other Accounts	290
Deductions	(709)	(1,766)	(390)
Balance at End of Period	1,667	730	2,064
Valuation Allowance of Deferred Tax Assets [Member]
Valuation Allowance [Line Items]
Balance at Beginning of Period	2,748	3,157	4,620
Charged to Costs and Expenses	3	92	4
Deductions	(699)	(501)	(1,467)
Balance at End of Period	$ 2,052	$ 2,748	$ 3,157