Employee Benefit Plans Textual (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Multiemployer Pension Plan, California [Member]
Defined Benefit Plan Disclosure [Line Items]
Multiemployer Plans, Withdrawal Obligation		$ 720
Multiemployer Pension Plan, Ohio [Member]
Defined Benefit Plan Disclosure [Line Items]
Multiemployer Plans, Withdrawal Obligation	5,407
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Effect of one percentage point increase on accumulated postretirement benefit obligation	114
Effect of one percentage point decrease on accumulated postretirement benefit obligation	105
Other Postretirement Benefit Plan [Member] | Minimum
Defined Benefit Plan Disclosure [Line Items]
Medical postretirement plans, qualifying retirement age range	62 years
Other Postretirement Benefit Plan [Member] | Maximum
Defined Benefit Plan Disclosure [Line Items]
Medical postretirement plans, qualifying retirement age range	65 years
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected 2014 amortization of pension prior service costs	378
Expected 2014 amortization of actuarial loss	3,912
Projected benefit obligation, pension plans with accumulated benefit obligations in excess of plan assets	66,341	5,095
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation	65,657	5,095
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets	49,598	0
Pension Plans | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Company's Pension Plan Asset Allocation, Description	entirely	Entirely
Defined Benefit Plan, Target Plan Asset Allocations	100.00%
Pension Plans | Corporate Bond Securities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Fixed Income Securities Allocations	75.00%	71.00%
Pension Plans | US Treasury and Government
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Fixed Income Securities Allocations	17.00%	20.00%
Pension Plans | Agency Securities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Fixed Income Securities Allocations	4.00%	5.00%
Pension Plans | Other fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Fixed Income Securities Allocations	4.00%	4.00%
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution, allowable matching percentage based on terms of the plan	100.00%
Employer matching contribution, percent	6.00%
Defined Contribution Plan, Cost Recognized	$ 3,743	$ 4,265	$ 5,260