Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Finite-lived Intangible Assets [Roll Forward]
CDI and CRI Balance, beginning of period	$ 64,187	$ 64,187	$ 93,824	$ 64,187	$ 95,524
Accumulated Amortization, beginning of period	(30,885)	(27,821)	(45,687)	(27,821)	(42,304)
Amortization	(3,065)	(3,064)	(4,371)	(6,129)	(9,117)
Fully amortized portion	0	0	17,311	0	17,311
Reduction due to sale of PWEF leasing unit	0	0	0	0	1,363
CDI and CRI Balance, end of period	64,187	64,187	76,513	64,187	76,513
Accumulated Amortization, end of period	(33,950)	(30,885)	(32,747)	(33,950)	(32,747)
Net CDI and CRI, end of period	30,237	33,302	43,766	30,237	43,766
CDI and CRI
Finite-lived Intangible Assets [Roll Forward]
Fully amortized portion	0	0	17,311	0	17,311
Reduction due to sale of PWEF leasing unit	$ 0	$ 0	$ 0	$ 0	$ (1,700)