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Employee Benefit Plans Benefits (Details) (USD $)	12 Months Ended
Employee Benefit Plans Benefits (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Compensation expense	$ 10,157,000	$ 14,284,000	$ 13,817,000
Amount to be amortized from accumulated other comprehensive income (loss) in next twelve months	3,600,000
Other Postretirement Benefit Plan \| 401k Plan
Defined Benefit Plan Disclosure [Line Items]
Compensation expense	8,643,000	11,807,000	11,983,000
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	$ 1,514,000	$ 2,477,000	$ 1,834,000