Income Taxes - Income Tax Expense Components and Effective Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current
Federal									$ (8,471)	$ 9,424	$ 14,384
State									23,154	13,251	237
Foreign									5,148	4,435	5,484
Total									19,831	27,110	20,105
Deferred
Federal									40,038	54,858	(62,913)
State									(9,564)	3,722	9,340
Foreign									(64)	406	(156)
Total									30,410	58,986	(53,729)
Total
Federal									31,567	64,282	(48,529)
State									13,590	16,973	9,577
Foreign									5,084	4,841	5,328
Income tax expense (benefit)	$ 21,375	$ (11,735)	$ 19,314	$ 21,287	$ 20,013	$ 28,034	$ 16,418	$ 21,631	$ 50,241	$ 86,096	$ (33,624)
Reconciliation of effective income tax rate from the federal income tax rate
Federal income tax rate									21.00%	21.00%	35.00%
Increase (decrease) resulting from:
Tax basis adjustment									(3.30%)	0.00%	0.00%
State income tax, net of federal tax									3.01%	3.34%	3.92%
Tax credit investments									(1.94%)	(0.34%)	(0.89%)
Tax-exempt income									(1.74%)	(1.64%)	(3.86%)
Merger deferred tax reprice									(1.59%)	0.00%	0.00%
State tax settlements, net of federal tax									(1.40%)	0.00%	(1.38%)
Non-controlling interest tax effect									(0.67%)	(0.59%)	(1.45%)
Stock compensation									(0.64%)	(0.64%)	(1.15%)
Tax reform effects, net									0.00%	(0.26%)	(53.29%)
Nondeductible goodwill impairment effect									0.00%	0.00%	10.43%
Other, net									1.34%	0.56%	(1.05%)
Effective income tax rate									14.07%	21.43%	(13.72%)