Segment Operating Results Assets by Geographic Area (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Assets	$ 1,479,171	$ 1,446,556	$ 1,180,783
United States [Member]
Segment Reporting Information [Line Items]
Assets	1,135,570	1,099,363
Europe And Other [Member]
Segment Reporting Information [Line Items]
Assets	221,358	160,934
Latin America [Member]
Segment Reporting Information [Line Items]
Assets	$ 122,243	$ 186,259