Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangible Assets - Schedule of changes in the carrying amount of goodwill (Details)

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Goodwill and Other Intangible Assets - Schedule of changes in the carrying amount of goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Goodwill    
Beginning balance $ 303,875 $ 0
Goodwill resulting from business combination and purchase price adjustments 2,816 303,875
Ending balance $ 306,691 $ 303,875