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Goodwill (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Changes in the carrying amount of goodwill    
Balance at the beginning of year $ 143,874 $ 140,341
Additions 3,423 3,533
Balance at end of period $ 147,297 $ 143,874