Segment and Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Total revenues	$ 210,116	$ 178,701	$ 622,418	$ 515,992
United States	354,287		354,287		$ 377,273
Total long-lived assets	354,287		354,287		377,273
UNITED STATES
Total revenues	142,691	119,177	424,804	349,226
United States	257,217		257,217		271,796
Total long-lived assets	257,217		257,217		271,796
CANADA
Total revenues	19,939	18,836	57,205	55,922
IRELAND
Total revenues	18,068	11,363	54,517	32,118
All Other Countries [Member]
Total revenues	29,418	$ 29,325	85,892	$ 78,726
United States	97,070		97,070		105,477
Total long-lived assets	$ 97,070		$ 97,070		$ 105,477