Employee Benefit Plans Employee Benefit Plans - Various (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components of net periodic pension expense:
Interest cost	$ 2,289	$ 2,360	$ 2,112
Expected return on plan assets	(3,199)	(3,105)	(2,705)
Amortization of net loss	1,429	320	1,348
Total net periodic pension expense (income)	519	(425)	755
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	62,107	50,684
Interest cost	2,289	2,360	2,112
Benefits paid	(3,088)	(1,876)
Actuarial (gains) losses	(3,035)	10,939
Projected benefit obligation at year end	58,273	62,107	50,684
Change in plan assets:
Fair value of plan assets at beginning of year	45,187	42,965
Actual (loss) return	(1,109)	2,160
Employer contributions	0	1,938
Benefits paid	(3,088)	(1,876)
Fair value of plan assets at year end	40,990	45,187	$ 42,965
Funded status (Accrued pension liabilities)	(17,283)	(16,920)
Unrecognized actuarial loss recognized in accumulated other comprehensive loss	19,657	$ 19,814
Defined Benefit Plan, Amortization of Net Gains (Losses)	$ 1,537
Assumptions used to determine benefit obligation at year end:
Discount rate	4.00%	3.75%	4.75%
Assumptions used to determine net periodic benefit cost:
Discount rate	3.75%	4.75%	3.75%
Expected long-term weighted-average rate of return on plan assets	7.25%	7.25%	7.25%
Expected future benefit payments
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	$ 2,300
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	2,500
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	2,700
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	2,800
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	2,900
In aggregate during five years thereafter	16,200
Multiemployer Plan, Period Contributions	739	$ 992	$ 908
Defined contribution expense	10,818	10,773	9,814
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 255	$ 409	$ 276