Employee Benefit Plans - Fair Value of Plan Assets (Details) (USD $) | 12 Months Ended | |
In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 |
Level 3 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | $14,937 | $11,572 | $11,614 |
Actual return on plan assets sold during the period | 0 | -52 | ' |
Actual return on plan assets still held | 2,958 | 359 | ' |
Business acquisitions | 0 | 4,559 | ' |
Purchases | 1,863 | 0 | ' |
Sales | -1,456 | -4,908 | ' |
Real estate funds [Member] | Level 3 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 14,937 | 10,116 | 7,053 |
Actual return on plan assets sold during the period | 0 | 0 | ' |
Actual return on plan assets still held | 2,958 | 359 | ' |
Business acquisitions | 0 | 3,103 | ' |
Purchases | 1,863 | 0 | ' |
Sales | 0 | -399 | ' |
Other plan assets [Member] | Level 3 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 1,456 | 4,561 |
Actual return on plan assets sold during the period | 0 | -52 | ' |
Actual return on plan assets still held | 0 | 0 | ' |
Business acquisitions | 0 | 1,456 | ' |
Purchases | 0 | 0 | ' |
Sales | -1,456 | -4,509 | ' |
U.S. Pension Plan, Defined Benefit [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 595,143 | 554,648 | 515,191 |
Business acquisitions | 0 | 0 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Level 1 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 278,753 | 236,998 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Level 2 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 316,390 | 317,650 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Level 3 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Equity - U.S. Companies [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 180,038 | 153,939 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Equity - U.S. Companies [Member] | Level 1 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 180,038 | 153,939 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Equity - U.S. Companies [Member] | Level 2 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Equity - U.S. Companies [Member] | Level 3 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Equity - Non-U.S. Companies [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 5,526 | 6,478 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Equity - Non-U.S. Companies [Member] | Level 1 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 5,526 | 6,478 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Equity - Non-U.S. Companies [Member] | Level 2 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Equity - Non-U.S. Companies [Member] | Level 3 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Corporate bonds [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 53,924 | 59,293 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Corporate bonds [Member] | Level 1 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Corporate bonds [Member] | Level 2 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 53,924 | 59,293 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Corporate bonds [Member] | Level 3 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Private placements [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 3,374 | 7,238 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Private placements [Member] | Level 1 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Private placements [Member] | Level 2 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 3,374 | 7,238 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Private placements [Member] | Level 3 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Government securities [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 112,142 | 132,604 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Government securities [Member] | Level 1 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 25,035 | 19,888 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Government securities [Member] | Level 2 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 87,107 | 112,716 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Government securities [Member] | Level 3 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Mutual funds [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 59,387 | 45,376 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Mutual funds [Member] | Level 1 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 59,387 | 45,376 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Mutual funds [Member] | Level 2 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Mutual funds [Member] | Level 3 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Collective trusts [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 138,236 | 109,002 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Collective trusts [Member] | Level 1 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Collective trusts [Member] | Level 2 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 138,236 | 109,002 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Collective trusts [Member] | Level 3 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Real estate funds [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 33,749 | 29,401 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Real estate funds [Member] | Level 1 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Real estate funds [Member] | Level 2 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 33,749 | 29,401 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Real estate funds [Member] | Level 3 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Cash and equivalents [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 8,767 | 11,317 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Cash and equivalents [Member] | Level 1 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 8,767 | 11,317 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Cash and equivalents [Member] | Level 2 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
U.S. Pension Plan, Defined Benefit [Member] | Cash and equivalents [Member] | Level 3 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 203,681 | 181,416 | 121,807 |
Business acquisitions | 0 | 38,939 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Level 1 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 41,795 | 34,648 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Level 2 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 146,949 | 135,196 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Level 3 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 14,937 | 11,572 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Common stocks [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 35,010 | 31,268 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Common stocks [Member] | Level 1 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 35,010 | 31,268 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Common stocks [Member] | Level 2 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Common stocks [Member] | Level 3 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Fixed income investments [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 75,574 | 57,049 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Fixed income investments [Member] | Level 1 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Fixed income investments [Member] | Level 2 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 75,574 | 57,049 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Fixed income investments [Member] | Level 3 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Common stock funds [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 66,285 | 75,729 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Common stock funds [Member] | Level 1 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Common stock funds [Member] | Level 2 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 66,285 | 75,729 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Common stock funds [Member] | Level 3 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Real estate funds [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 14,937 | 10,116 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Real estate funds [Member] | Level 1 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Real estate funds [Member] | Level 2 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Real estate funds [Member] | Level 3 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 14,937 | 10,116 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Cash and equivalents [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 6,785 | 3,380 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Cash and equivalents [Member] | Level 1 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 6,785 | 3,380 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Cash and equivalents [Member] | Level 2 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Cash and equivalents [Member] | Level 3 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Other plan assets [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 5,090 | 3,874 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Other plan assets [Member] | Level 1 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 0 | 0 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Other plan assets [Member] | Level 2 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | 5,090 | 2,418 | ' |
Non-U.S. Pension Plans, Defined Benefit [Member] | Other plan assets [Member] | Level 3 [Member] | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' |
Fair value of plan assets | $0 | $1,456 | ' |