Employee Benefit Plans - Narrative (Details) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Assets contributed to 401(k) Plan		$ 0	$ 0	$ 7,940,000
401(k) Plan distribution period (in years)		5 years		7 years
Pension Plan assets reverted to the Company	$ 23,800,000	$ 0	0	$ 23,820,000
Prepaid pension asset		0	0
Pension charges		0	0	13,529,000
Net periodic pension cost, including settlements				8,747,000
Excise tax on pension plan				4,800,000
Settlement losses				7,107,000
Net periodic pension cost included in accumulated other comprehensive loss	$ 0	0	0	$ 0
Expected long-term rate on plan assets				0.00%
Plan assets		0	0
Restricted investments		5,636,000	7,072,000
Compensation expense for assets allocated to participants		1,400,000	1,300,000
Gain on unallocated asset		$ 100,000	$ 100,000