Schedule II - Valuation and Qualifiying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, Beginning of Year	$ 1,617	$ 1,630	$ 1,502
Additions Charged to Revenues, Costs and Expenses	885	997	1,196
Additions/(Deductions) Charged to Balance Sheet Accounts	(1,230)	(109)	(334)
(Deductions) Charged to Revenues, Costs and Expenses	(424)	(901)	(734)
Balance, End of Year	848	1,617	1,630
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, Beginning of Year	88,180	83,846	76,963
Additions Charged to Revenues, Costs and Expenses	321	5,031	6,883
Additions/(Deductions) Charged to Balance Sheet Accounts	0	0	0
(Deductions) Charged to Revenues, Costs and Expenses	(5,962)	(697)	0
Balance, End of Year	$ 82,539	$ 88,180	$ 83,846