Intangible Assets and Goodwill Intangible Assets and Goodwill (Details 2) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of Intangible Assets	$ 4,629	$ 4,498	$ 5,112
Finite-Lived Intangible Assets, Amortization Expense, 2018	1,932
Finite-Lived Intangible Assets, Amortization Expense, 2019	1,089
Finite-Lived Intangible Assets, Amortization Expense, 2020	642
Finite-Lived Intangible Assets, Amortization Expense, 2021	620
Finite-Lived Intangible Assets, Amortization Expense, 2022	$ 620