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Goodwill and Other Intangible Assets Rollforward (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill [Line Items] |  |  |
Balance, beginning of year | $ 831,151,000 | $ 295,609,000 |
Merger and other acquisitions | 554,000 | 543,716,000 |
Effect of foreign currency translation | 2,061,000 | (8,276,000) |
Other adjustments | (2,621,000) | 102,000 |
Balance, end of year | 831,145,000 | 831,151,000 | $ 295,609,000
Goodwill impairment | 0 | 0 | 7,913,000
United States |  |  |
Goodwill [Line Items] |  |  |
Balance, beginning of year | 746,204,000 | 222,901,000 |
Merger and other acquisitions | 414,000 | 523,303,000 |
Effect of foreign currency translation | 0 | 0 |
Other adjustments | (2,621,000) | 0 |
Balance, end of year | 743,997,000 | 746,204,000 | 222,901,000
Latin America Operations |  |  |
Goodwill [Line Items] |  |  |
Balance, beginning of year | 84,947,000 | 72,708,000 |
Merger and other acquisitions | 140,000 | 20,413,000 |
Effect of foreign currency translation | 2,061,000 | (8,276,000) |
Other adjustments | 0 | 102,000 |
Balance, end of year | $ 87,148,000 | $ 84,947,000 | $ 72,708,000

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