Equity-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Employee stock-based compensation expense
Equity-based compensation capitalized (a)	$ (124)	$ (6)	$ (184)	$ (6)
Equity-based compensation expense	1,796	2,156	5,847	3,424
Tax benefit from equity-based compensation	(254)	(305)	(827)	(484)
Excess tax benefit from equity-based compensation	57	(73)	113	(145)
Net compensation cost	$ 1,599	1,778	$ 5,133	2,795
Restricted Stock Units
Additional shares available to grant under plan (in shares)	2,187,446		2,187,446
Time-based Restricted Stock Units
Employee stock-based compensation expense
Equity-based compensation expense	$ 1,872	1,061	$ 3,963	1,861
Restricted Stock Units
Nonvested at beginning of period			298,610
Granted			158,342
Shares vested			(66,918)
Forfeited			(5,844)
Nonvested at end of period	384,190		384,190
Nonvested at beginning of period, Weighted average grant date fair value per share			$ 51.97
Granted, Weighted average grant date fair value per share			38.61
Shares vested, Weighted average grant date fair value per share			46.66
Forfeited, Weighted average grant date fair value per share			46.41
Nonvested at end of period, Weighted average grant date fair value per share	$ 47.48		$ 47.48
Unrecognized compensation cost	$ 13,200		$ 13,200
Period for recognition of RSU compensation expense			2 years 1 month 24 days
Performance-based Restricted Stock Units
Employee stock-based compensation expense
Equity-based compensation expense	$ (872)	1,101	$ 250	1,569
Restricted Stock Units
Nonvested at beginning of period			179,615
Granted			93,028
Shares vested			(5,620)
Forfeited			(30,716)
Nonvested at end of period	236,307		236,307
Nonvested at beginning of period, Weighted average grant date fair value per share			$ 55.75
Granted, Weighted average grant date fair value per share			41.37
Shares vested, Weighted average grant date fair value per share			56.59
Forfeited, Weighted average grant date fair value per share			52.97
Nonvested at end of period, Weighted average grant date fair value per share	$ 39.24		$ 39.24
Unrecognized compensation cost	$ 4,300		$ 4,300
Period for recognition of RSU compensation expense			2 years 21 days
Bonus settled in shares
Employee stock-based compensation expense
Equity-based compensation expense	$ 920	$ 0	$ 1,818	$ 0