Segment Operating Results - Assets by Geographic Area (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Segment Reporting Information [Line Items]
Assets	$ 1,432,762	$ 1,662,346	$ 1,284,677
United States [Member]
Segment Reporting Information [Line Items]
Assets	1,167,473	1,376,101
Europe and Other [Member]
Segment Reporting Information [Line Items]
Assets	174,833	190,380
Latin America [Member]
Segment Reporting Information [Line Items]
Assets	$ 90,456	$ 95,865