Schedule of Valuation and Qualifying Accounts (Details) (Allowance for doubtful accounts [Member], 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 at Beginning of Year	$ 2,749		$ 2,880		$ 3,297
Charged to Expenses or Other Accounts, Net	944		135		0
Deductions and Adjustments	(1,180)	[1]	(266)	[1]	(417)	[1]
Balance at End of Year	$ 2,513		$ 2,749		$ 2,880

[1] Deductions and adjustments for the allowances primarily relate to accounts written off.