Goodwill and Intangible Assets Goodwill (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss	$ 195,846	$ 0
Share Price	$ 17.96	$ 34.20	$ 95.64
Goodwill Beginning	$ 405,522	$ 398,905
Foreign currency translation adjustments and other	(1,887)	(2,676)
Goodwill acquired during the year	10,601	9,293
Goodwill Ending	218,390	405,522
Goodwill, Impairment Loss	$ (195,846)	$ 0