Schedule II (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2011
Allowance for doubtful accounts receivable:
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 5,861	$ 5,945	$ 1,926	$ 11,005
Charges (Credits) to Expense	(98)	4,054	(22)
Deductions- Write-offs	14	(35)	(9,057)
Balance at End of Year	5,861	5,945	1,926
Valuation/Allowance for deferred tax assets:
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	37,579	40,372	41,321	$ 41,271
Charges (Credits) to Expense	570	3,240	3,402
Deductions- Write-offs	(3,363)	(4,189)	(3,352)
Balance at End of Year	$ 37,579	$ 40,372	$ 41,321