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Acquisitions (Allocation of Purchase Consideration to the Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Jun. 09, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 292,390 |  | $ 236,044 | $ 341,174 |
Rough Brothers Incorporated |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash |  | $ 4,651 |  |  |
Working capital |  | 21,436 |  |  |
Property, plant, and equipment |  | 12,797 |  |  |
Acquired intangible assets |  | 56,392 |  |  |
Other assets |  | 3,049 |  |  |
Deferred income taxes |  | (4,892) |  |  |
Other liabilities |  | (3,028) |  |  |
Goodwill |  | 57,180 |  |  |
Fair value of purchase consideration |  | $ 147,585 |  |  |
2013 Acquisitions |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Working capital |  |  | 2,665 |  |
Property, plant, and equipment |  |  | 153 |  |
Acquired intangible assets |  |  | 2,170 |  |
Goodwill |  |  | 2,466 |  |
Fair value of purchase consideration |  |  | $ 7,454 |  | $ 7,454

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