Segment and Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Total revenues	$ 344,141	$ 292,724	$ 966,466	$ 861,236
Total long-lived assets	780,851		780,851		$ 593,595
UNITED STATES
Total revenues	278,917	221,031	763,494	649,103
Total long-lived assets	698,847		698,847		530,785
CANADA
Total revenues	16,825	18,353	51,178	56,503
IRELAND
Total revenues	14,228	18,182	44,604	52,296
All Other Countries [Member]
Total revenues	34,171	$ 35,158	107,190	$ 103,334
Total long-lived assets	$ 82,004		$ 82,004		$ 62,810