Employee Benefit Plans Benefits (Details) - USD ($) $ in Thousands		12 Months Ended
	Feb. 01, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Compensation expense		$ 10,525	$ 10,157	$ 14,284
Amount to be amortized from accumulated other comprehensive income (loss) in next twelve months		2,400
Other Postretirement Benefit Plan | 401k Plan
Defined Benefit Plan Disclosure [Line Items]
Compensation expense		$ 6,423	8,643	11,807
Maximum percentage of eligible employee’s covered compensation		5.00%
Percentage of plan vested		100.00%
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Compensation expense		$ 4,102	1,514	$ 2,477
Other Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Effect of curtailment	$ 3,400	0	$ 3,358
Plan amendment		$ 2,500