Segment and Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Total revenues	$ 200,502	$ 161,253
United States	386,248		$ 377,273
Total long-lived assets	386,248		377,273
UNITED STATES
Total revenues	137,639	109,032
United States	275,319		271,796
Total long-lived assets	275,319		271,796
CANADA
Total revenues	18,366	18,139
IRELAND
Total revenues	12,549	9,935
All Other Countries [Member]
Total revenues	31,948	$ 24,147
United States	110,929		105,477
Total long-lived assets	$ 110,929		$ 105,477