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Goodwill and Other Intangibles - Schedule of Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill          
Balance at beginning of year, net $ 29,835 $ 29,835 $ 23,414 $ 0  
Acquisitions 0 0 18,054 23,414  
Impairment losses 0 0 (11,633) 0  
Balance at end of year, net $ 29,835 29,835 29,835 23,414  
Accumulated impairment losses   $ (11,633) $ (11,633) $ 0 $ 0