Income Taxes Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ (98,575)	$ (26,201)	$ (32,724)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	(15,689)	(6,014)	(6,479)
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount	4,472	3,979	1,847
Income Tax Reconciliation Change In Cash Surrender Value Of Life Insurance	739	407	442
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	3,567	2,480	1,313
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount	(6,792)	(4,730)	(322)
Nondeductible acquisition-related expense	(2,994)	(1,196)	(532)
Income Tax Reconciliation Acquisition Related Securities Gain Loss	0	1,828	0
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	2,533	(298)	(240)
Income Tax Expense (Benefit), Continuing Operations, Discontinued Operations, Extraordinary Items	$ 112,739	$ 29,745	$ 36,695