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Acquisitions - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Business Combinations [Abstract] |  |
Revenues | $ 873,427 | $ 924,806
Net income | $ 91,602 | $ 118,232
Earnings per share: |  |
Net income per share available to common stockholders - basic (in dollars per share) | $ 0.46 | $ 0.59
Net income per share available to common stockholders - diluted (in dollars per share) | $ 0.45 | $ 0.59

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