Retirement Plans (Details) (USD $) | 12 Months Ended |
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 |
Defined Contribution Plan [Member] | ' | ' | ' |
Defined Contribution Plans Disclosure [Abstract] | ' | ' | ' |
Percentage of matching contributions under defined contribution plan (in hundredths) | 4.00% | ' | ' |
Total expense for defined contribution plans | $4,700,000 | $4,700,000 | $4,300,000 |
Pension Plans, Defined Benefit [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Defined Benefit Plan, Assets for Plan Benefits | 37,122,000 | 35,141,000 | 30,969,000 |
Benefit obligation [Roll Forward] | ' | ' | ' |
Benefit obligation at beginning of year | 76,957,000 | 67,211,000 | ' |
Service cost | 3,260,000 | 2,583,000 | 2,419,000 |
Interest cost | 2,557,000 | 2,659,000 | 2,778,000 |
Foreign currency exchange rate changes | -703,000 | 799,000 | ' |
Benefits paid | -5,194,000 | -3,045,000 | ' |
Actuarial (gain) loss | -4,295,000 | 6,750,000 | ' |
Benefit obligation at end of year | 72,582,000 | 76,957,000 | 67,211,000 |
Change in fair value of plan assets [Roll Forward] | ' | ' | ' |
Plan assets at beginning of year | 35,141,000 | 30,969,000 | ' |
Company contributions | 5,701,000 | 4,075,000 | ' |
Foreign currency exchange rate changes | -539,000 | 973,000 | ' |
Benefits paid | -5,194,000 | -3,045,000 | ' |
Actual gain on plan assets | 2,077,000 | 2,169,000 | ' |
Plan assets at end of year | 37,122,000 | 35,141,000 | 30,969,000 |
Funded status | -35,460,000 | -41,816,000 | ' |
Accumulated benefit obligation | 68,391,000 | 70,230,000 | ' |
Amounts recognized in Consolidated Balance Sheets [Abstract] | ' | ' | ' |
Accrued employee and retiree benefits | -40,350,000 | -52,825,000 | ' |
Prepaid expenses and other current assets | 4,890,000 | 11,009,000 | ' |
Net liability | -35,460,000 | -41,816,000 | ' |
Components of annual benefit cost [Abstract] | ' | ' | ' |
Service cost | 3,260,000 | 2,583,000 | 2,419,000 |
Interest cost | 2,557,000 | 2,659,000 | 2,778,000 |
Expected return on plan assets | -1,689,000 | -1,428,000 | -1,520,000 |
Amortization of prior service cost | 172,000 | 1,971,000 | 3,112,000 |
Recognized actuarial loss | 3,203,000 | 799,000 | 1,388,000 |
Settlement expense | 1,177,000 | 0 | 0 |
Defined benefit expense | 8,680,000 | 6,584,000 | 8,177,000 |
Weighted-average liability assumptions [Abstract] | ' | ' | ' |
Discount rate (in hundredths) | 3.91% | 3.27% | ' |
Expected return on plan assets (in hundredths) | 5.12% | 4.76% | ' |
Rate of compensation increase (in hundredths) | 4.59% | 4.01% | ' |
Weighted-average cost assumption [Abstract] | ' | ' | ' |
Discount rate (in hundredths) | 3.27% | 4.27% | ' |
Expected return on plan assets (in hundredths) | 4.76% | 5.00% | ' |
Rate of compensation increase (in hundredths) | 4.01% | 4.11% | ' |
Amounts recognized in Accumulated Other Comprehensive Income [Abstract] | ' | ' | ' |
Prior service cost | 1,182,000 | 1,362,000 | ' |
Unrecognized net actuarial loss | 7,944,000 | 17,031,000 | ' |
Other Comprehensive Income (Loss), Pension Adjustment, Net of Tax [Abstract] | ' | ' | ' |
Net actuarial (loss) gain arising during the period | 3,180,000 | -3,947,000 | 885,000 |
Amortization of actuarial loss, included in defined benefit expense | 2,006,000 | 526,000 | 866,000 |
Amortization of prior service cost, included in defined benefit expense | 108,000 | 1,205,000 | 1,901,000 |
Pension adjustment, net of tax | 5,294,000 | -2,216,000 | 3,652,000 |
Estimated Future Benefit Payments [Abstract] | ' | ' | ' |
Expected Future Benefit Payments in Year One | 21,700,000 | ' | ' |
Expected Future Benefit Payments in Year Two | 13,000,000 | ' | ' |
Expected Future Benefit Payments in Year Three | 2,900,000 | ' | ' |
Expected Future Benefit Payments in Year Four | 2,400,000 | ' | ' |
Expected Future Benefit Payments in Year Five | 2,200,000 | ' | ' |
Expected Future Benefit Payments in Five Fiscal Years Thereafter | 18,300,000 | ' | ' |
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year | 22,900,000 | ' | ' |
Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract] | ' | ' | ' |
Expected amoritization of actuarial gain in next fiscal year | 600,000 | ' | ' |
Expected amoritization of prior service cost in next fiscal year | 200,000 | ' | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Defined Benefit Plan, Assets for Plan Benefits | 7,369,000 | 6,651,000 | ' |
Change in fair value of plan assets [Roll Forward] | ' | ' | ' |
Plan assets at end of year | 7,369,000 | 6,651,000 | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Defined Benefit Plan, Assets for Plan Benefits | 29,753,000 | 28,490,000 | ' |
Change in fair value of plan assets [Roll Forward] | ' | ' | ' |
Plan assets at end of year | 29,753,000 | 28,490,000 | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0 | ' |
Change in fair value of plan assets [Roll Forward] | ' | ' | ' |
Plan assets at end of year | 0 | 0 | ' |
Pension Plans, Defined Benefit [Member] | Private Equity Funds, Domestic [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Defined Benefit Plan, Assets for Plan Benefits | 6,143,000 | 5,253,000 | ' |
Change in fair value of plan assets [Roll Forward] | ' | ' | ' |
Plan assets at end of year | 6,143,000 | 5,253,000 | ' |
Pension Plans, Defined Benefit [Member] | Private Equity Funds, Domestic [Member] | Fair Value, Inputs, Level 1 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Defined Benefit Plan, Assets for Plan Benefits | 6,143,000 | 5,253,000 | ' |
Change in fair value of plan assets [Roll Forward] | ' | ' | ' |
Plan assets at end of year | 6,143,000 | 5,253,000 | ' |
Pension Plans, Defined Benefit [Member] | Private Equity Funds, Domestic [Member] | Fair Value, Inputs, Level 2 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0 | ' |
Change in fair value of plan assets [Roll Forward] | ' | ' | ' |
Plan assets at end of year | 0 | 0 | ' |
Pension Plans, Defined Benefit [Member] | Private Equity Funds, Domestic [Member] | Fair Value, Inputs, Level 3 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0 | ' |
Change in fair value of plan assets [Roll Forward] | ' | ' | ' |
Plan assets at end of year | 0 | 0 | ' |
Pension Plans, Defined Benefit [Member] | Private Equity Funds, Foreign [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Defined Benefit Plan, Assets for Plan Benefits | 7,294,000 | 5,412,000 | ' |
Change in fair value of plan assets [Roll Forward] | ' | ' | ' |
Plan assets at end of year | 7,294,000 | 5,412,000 | ' |
Pension Plans, Defined Benefit [Member] | Private Equity Funds, Foreign [Member] | Fair Value, Inputs, Level 1 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0 | ' |
Change in fair value of plan assets [Roll Forward] | ' | ' | ' |
Plan assets at end of year | 0 | 0 | ' |
Pension Plans, Defined Benefit [Member] | Private Equity Funds, Foreign [Member] | Fair Value, Inputs, Level 2 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Defined Benefit Plan, Assets for Plan Benefits | 7,294,000 | 5,412,000 | ' |
Change in fair value of plan assets [Roll Forward] | ' | ' | ' |
Plan assets at end of year | 7,294,000 | 5,412,000 | ' |
Pension Plans, Defined Benefit [Member] | Private Equity Funds, Foreign [Member] | Fair Value, Inputs, Level 3 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0 | ' |
Change in fair value of plan assets [Roll Forward] | ' | ' | ' |
Plan assets at end of year | 0 | 0 | ' |
Pension Plans, Defined Benefit [Member] | Fixed Income Funds [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Defined Benefit Plan, Assets for Plan Benefits | 23,162,000 | 24,369,000 | ' |
Change in fair value of plan assets [Roll Forward] | ' | ' | ' |
Plan assets at end of year | 23,162,000 | 24,369,000 | ' |
Pension Plans, Defined Benefit [Member] | Fixed Income Funds [Member] | Fair Value, Inputs, Level 1 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Defined Benefit Plan, Assets for Plan Benefits | 1,186,000 | 1,364,000 | ' |
Change in fair value of plan assets [Roll Forward] | ' | ' | ' |
Plan assets at end of year | 1,186,000 | 1,364,000 | ' |
Pension Plans, Defined Benefit [Member] | Fixed Income Funds [Member] | Fair Value, Inputs, Level 2 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Defined Benefit Plan, Assets for Plan Benefits | 21,976,000 | 23,005,000 | ' |
Change in fair value of plan assets [Roll Forward] | ' | ' | ' |
Plan assets at end of year | 21,976,000 | 23,005,000 | ' |
Pension Plans, Defined Benefit [Member] | Fixed Income Funds [Member] | Fair Value, Inputs, Level 3 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0 | ' |
Change in fair value of plan assets [Roll Forward] | ' | ' | ' |
Plan assets at end of year | 0 | 0 | ' |
Pension Plans, Defined Benefit [Member] | Other Investments [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Defined Benefit Plan, Assets for Plan Benefits | 523,000 | 107,000 | ' |
Change in fair value of plan assets [Roll Forward] | ' | ' | ' |
Plan assets at end of year | 523,000 | 107,000 | ' |
Pension Plans, Defined Benefit [Member] | Other Investments [Member] | Fair Value, Inputs, Level 1 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Defined Benefit Plan, Assets for Plan Benefits | 40,000 | 34,000 | ' |
Change in fair value of plan assets [Roll Forward] | ' | ' | ' |
Plan assets at end of year | 40,000 | 34,000 | ' |
Pension Plans, Defined Benefit [Member] | Other Investments [Member] | Fair Value, Inputs, Level 2 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Defined Benefit Plan, Assets for Plan Benefits | 483,000 | 73,000 | ' |
Change in fair value of plan assets [Roll Forward] | ' | ' | ' |
Plan assets at end of year | 483,000 | 73,000 | ' |
Pension Plans, Defined Benefit [Member] | Other Investments [Member] | Fair Value, Inputs, Level 3 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0 | ' |
Change in fair value of plan assets [Roll Forward] | ' | ' | ' |
Plan assets at end of year | $0 | $0 | ' |