Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred income tax assets
Net operating loss carryforwards	$ 308,617	$ 422,968
Allowance for loan losses	103,884	111,814
Tax credit carryforwards	59,434	52,194
Deferred revenue	16,529	18,770
Share-based compensation	10,800	12,152
Non-performing loan interest	16,604	20,366
Net unrealized losses on investment securities available for sale	3,072	0
Other	28,950	34,576
Total gross deferred tax assets	547,890	672,840
Less valuation allowance	(11,713)	(12,303)
Total deferred tax assets	536,177	660,537
Deferred tax liabilities
Excess tax over financial statement depreciation	(8,564)	(10,546)
Net unrealized gains on investment securities available for sale	0	(7,893)
Ownership interest in partnership	(4,537)	(5,933)
Fixed assets held for sale	(5,985)	(7,287)
Other	(5,143)	(6,414)
Total gross deferred tax liabilities	(24,229)	(38,073)
Net deferred tax asset	$ 511,948	$ 622,464