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Acquisitions - Pro Forma Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Business Combinations [Abstract] |  |
Revenue | $ 603,673 | $ 547,381
Earnings | $ 15,776 | $ 15,460

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- Definition Combination of Entities under Common Control, Pro Forma Revenue + References No definition available. + Details
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