Schedule II - Valuation and Qualifying Accounts (Details) (Allowance for Doubtful Accounts [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 2,105	$ 2,065	$ 1,983
Charged to Expense	65	40	82
Additions/ (Deductions)	(2,170)	0	0
Balance at End of Year	$ 0	$ 2,105	$ 2,065