Geographic Concentrations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	$ 485,984	$ 466,182	$ 438,460	$ 393,079	$ 415,817	$ 402,010	$ 394,667	$ 391,141	$ 1,783,705	$ 1,603,635	$ 1,543,587
Total Assets	4,170,683				2,532,428				4,170,683	2,532,428
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues									1,509,401	1,313,811	1,253,879
Total Assets	3,812,761				2,242,078				3,812,761	2,242,078
Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues									216,741	227,374	219,738
Total Assets	274,288				226,666				274,288	226,666
New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues									30,047	32,363	33,289
Total Assets	67,046				51,419				67,046	51,419
Argentina
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues									9,647	11,752	18,319
Total Assets	7,794				7,154				7,794	7,154
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues									17,869	18,335	$ 18,362
Total Assets	$ 8,794				$ 5,111				$ 8,794	$ 5,111