Segment Operating Results Assets by Geographic Area (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Segment Reporting Information [Line Items]
Assets	$ 1,299,547	$ 1,446,556	$ 1,147,897
United States [Member]
Segment Reporting Information [Line Items]
Assets	970,784	1,099,363
Europe And Other [Member]
Segment Reporting Information [Line Items]
Assets	173,340	160,934
Latin America [Member]
Segment Reporting Information [Line Items]
Assets	$ 155,423	$ 186,259