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Goodwill and Other Intangible Assets (Goodwill) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]    
Cash paid for acquisition $ 6,100  
Goodwill [Roll Forward]    
Goodwill beginning balance 256,232 $ 248,428
Goodwill resulting from business acquisitions 5,369 7,773
Reduction in goodwill resulting from a business acquisition purchase price allocation adjustment (525) 0
Foreign currency translation (425) 31
Goodwill ending balance 260,651 256,232
Accumulated goodwill impairment loss $ 106,991 $ 106,991