Schedule II Valuation and Qualifying Accounts (Details) - Allowance for deferred tax asset - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Changes in valuation and qualifying Accounts
Balance at the beginning of the period	$ 75,941	$ 59,540	$ 63,605
Charged to Costs and Expenses	40,600	16,401	28,040
Deductions From Reserves			32,105
Balance at the end of the period	$ 116,541	$ 75,941	$ 59,540