Schedule II (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for doubtful accounts receivable:
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 5,945	$ 1,926	$ 11,005	$ 11,833
Charges (Credits) to Expense	4,054	(22)	(18)
Deductions- Write-offs	(35)	(9,057)	(810)
Balance at End of Year	5,945	1,926	11,005	11,833
Valuation/Allowance for deferred tax assets:
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	40,372	41,321	41,271	38,742
Charges (Credits) to Expense	3,240	3,402	2,935
Deductions- Write-offs	(4,189)	(3,352)	(406)
Balance at End of Year	$ 40,372	$ 41,321	$ 41,271	$ 38,742