Employee Benefit Plan - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Assets Contributed to 401(k) Plan	$ 7,940,000	$ 0	$ 0
Pension Plan assets reverted to the Company	23,820,000	0	0
Settlement losses and curtailment charges	13,529,000	1,500,000	2,999,000
Defined Benefit Plan, Net Periodic Benefit Cost	8,747,000	1,500,000	2,999,000
Excise Tax on Pension Plan	4,800,000
Curtailment charge	0	0	2,063,000
Settlement charges	7,107,000	739,000	1,162,000
Prepaid pension asset	0	35,117,000
Accumulated benefit obligation of the pension plan	0	23,531,000	26,741,000
Net periodic pension cost included in accumulated other comprehensive loss	$ 0	$ 5,400,000