Segment Operating Results Assets by Geographic Area (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Segment Reporting Information [Line Items]
Assets	$ 1,330,389	$ 1,446,556	$ 1,223,751
United States [Member]
Segment Reporting Information [Line Items]
Assets	1,004,390	1,099,363
Europe And Other [Member]
Segment Reporting Information [Line Items]
Assets	198,251	160,934
Latin America [Member]
Segment Reporting Information [Line Items]
Assets	$ 127,748	$ 186,259