Income Taxes (Rollforward of Valuation Allowances) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 94,921	$ 70,411	$ 70,821
Expenses	46,385	54,707	49,011
Deductions	(12,977)	(3,810)	(7,265)
Balance at End of Year	114,964	94,921	70,411
Valuation Allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	352,528	331,458	326,837
Purchase accounting	172,932	0	613
Expenses	24,332	28,364	31,540
Deductions	(42,437)	(2,344)	(23,622)
Other activity (not resulting in expense or deduction)	(3,824)	(4,950)	(3,910)
Balance at End of Year	$ 503,531	$ 352,528	$ 331,458