Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net income	$ 32,162	$ 32,649	$ 40,230	$ 72,626
Less: Net (income) loss attributable to redeemable noncontrolling interests	(3,642)	(1,316)	8,862	(8,750)
Net income attributable to common stockholders	$ 28,520	$ 31,333	$ 49,092	$ 63,876
Basic weighted average shares outstanding (shares)	47,826,000	47,304,000	47,739,000	47,226,000
Dilutive potential shares from restricted stock units (shares)	746,000	871,000	810,000	716,000
Diluted weighted average shares outstanding (shares)	48,572,000	48,175,000	48,549,000	47,942,000
Basic earnings per share attributable to common stockholders (in dollars per share)	$ 0.60	$ 0.66	$ 1.03	$ 1.35
Diluted earnings per share attributable to common stockholders (in dollars per share)	$ 0.59	$ 0.65	$ 1.01	$ 1.33
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	63,000	0	0	2,300