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Acquisitions, Divestiture, Intangible Assets and Goodwill (Future Amortization) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 42,564  
2019 38,838  
2020 34,251  
2021 30,631  
2022 29,223  
Thereafter 96,679  
Net Carrying Amount $ 272,186 $ 165,172