Operations by Geographic Location - Long-Lived Assets by Geographic Area (Details) - USD ($) $ in Thousands		Mar. 31, 2017	Dec. 31, 2016
Long-Lived Assets by Geographic Location
Total property and equipment, net		$ 57,485	$ 58,306
North America
Long-Lived Assets by Geographic Location
Total property and equipment, net	[1]	37,871	41,057
United States
Long-Lived Assets by Geographic Location
Total property and equipment, net		37,400	40,600
Europe, Middle East and Africa
Long-Lived Assets by Geographic Location
Total property and equipment, net		11,975	11,235
Asia-Pacific
Long-Lived Assets by Geographic Location
Total property and equipment, net		6,755	5,101
Latin America
Long-Lived Assets by Geographic Location
Total property and equipment, net		$ 884	$ 913

[1] Long-lived assets for the North America region include property and equipment, net attributable to the United States of $37.4 million and $40.6 million as of March 31, 2017 and December 31, 2016, respectively.