Stock-Based Compensation - Additional Information Tables - RSUs and PSUs (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restricted stock units
Stock-based compensation additional disclosures
Grant date fair value of units outstanding	$ 41.70	$ 22.22	$ 13.76	$ 9.86
Aggregate market value of units vested	$ 12,833	$ 7,940	$ 4,768
Units outstanding	270,052	358,683	467,129	592,349
Restricted stock units | $24.65 - $31.50 Grant Date Fair Value
Stock-based compensation additional disclosures
Units outstanding	83,827
Restricted stock units | $31.51 - $44.16 Grant Date Fair Value
Stock-based compensation additional disclosures
Units outstanding	108,508
Restricted stock units | $44.17 - $76.01 Grant Date Fair Value
Stock-based compensation additional disclosures
Units outstanding	77,717
Restricted stock units | $76.02 - $86.29 Grant Date Fair Value
Stock-based compensation additional disclosures
Units outstanding	0
Restricted stock units | $24.65 - $86.29 Grant Date Fair Value
Stock-based compensation additional disclosures
Units outstanding	270,052
Restricted stock units | Minimum | $24.65 - $31.50 Grant Date Fair Value
Stock-based compensation additional disclosures
Grant date fair value of units outstanding	$ 24.65
Restricted stock units | Minimum | $31.51 - $44.16 Grant Date Fair Value
Stock-based compensation additional disclosures
Grant date fair value of units outstanding	31.51
Restricted stock units | Minimum | $44.17 - $76.01 Grant Date Fair Value
Stock-based compensation additional disclosures
Grant date fair value of units outstanding	44.17
Restricted stock units | Minimum | $76.02 - $86.29 Grant Date Fair Value
Stock-based compensation additional disclosures
Grant date fair value of units outstanding	76.02
Restricted stock units | Minimum | $24.65 - $86.29 Grant Date Fair Value
Stock-based compensation additional disclosures
Grant date fair value of units outstanding	24.65
Restricted stock units | Maximum | $24.65 - $31.50 Grant Date Fair Value
Stock-based compensation additional disclosures
Grant date fair value of units outstanding	31.50
Restricted stock units | Maximum | $31.51 - $44.16 Grant Date Fair Value
Stock-based compensation additional disclosures
Grant date fair value of units outstanding	44.16
Restricted stock units | Maximum | $44.17 - $76.01 Grant Date Fair Value
Stock-based compensation additional disclosures
Grant date fair value of units outstanding	76.01
Restricted stock units | Maximum | $76.02 - $86.29 Grant Date Fair Value
Stock-based compensation additional disclosures
Grant date fair value of units outstanding	86.29
Restricted stock units | Maximum | $24.65 - $86.29 Grant Date Fair Value
Stock-based compensation additional disclosures
Grant date fair value of units outstanding	86.29
Performance Stock Units
Stock-based compensation additional disclosures
Grant date fair value of units outstanding	$ 55.06	$ 37.79	$ 0	$ 8.68
Units outstanding	90,020	87,109	0	132,992
Performance Stock Units | $24.65 - $31.50 Grant Date Fair Value
Stock-based compensation additional disclosures
Units outstanding	0
Performance Stock Units | $31.51 - $44.16 Grant Date Fair Value
Stock-based compensation additional disclosures
Units outstanding	57,963
Performance Stock Units | $44.17 - $76.01 Grant Date Fair Value
Stock-based compensation additional disclosures
Units outstanding	0
Performance Stock Units | $76.02 - $86.29 Grant Date Fair Value
Stock-based compensation additional disclosures
Units outstanding	32,057
Performance Stock Units | $24.65 - $86.29 Grant Date Fair Value
Stock-based compensation additional disclosures
Units outstanding	90,020
Performance Stock Units | Minimum | $24.65 - $31.50 Grant Date Fair Value
Stock-based compensation additional disclosures
Grant date fair value of units outstanding	$ 24.65
Performance Stock Units | Minimum | $31.51 - $44.16 Grant Date Fair Value
Stock-based compensation additional disclosures
Grant date fair value of units outstanding	31.51
Performance Stock Units | Minimum | $44.17 - $76.01 Grant Date Fair Value
Stock-based compensation additional disclosures
Grant date fair value of units outstanding	44.17
Performance Stock Units | Minimum | $76.02 - $86.29 Grant Date Fair Value
Stock-based compensation additional disclosures
Grant date fair value of units outstanding	76.02
Performance Stock Units | Minimum | $24.65 - $86.29 Grant Date Fair Value
Stock-based compensation additional disclosures
Grant date fair value of units outstanding	24.65
Performance Stock Units | Maximum | $24.65 - $31.50 Grant Date Fair Value
Stock-based compensation additional disclosures
Grant date fair value of units outstanding	31.50
Performance Stock Units | Maximum | $31.51 - $44.16 Grant Date Fair Value
Stock-based compensation additional disclosures
Grant date fair value of units outstanding	44.16
Performance Stock Units | Maximum | $44.17 - $76.01 Grant Date Fair Value
Stock-based compensation additional disclosures
Grant date fair value of units outstanding	76.01
Performance Stock Units | Maximum | $76.02 - $86.29 Grant Date Fair Value
Stock-based compensation additional disclosures
Grant date fair value of units outstanding	86.29
Performance Stock Units | Maximum | $24.65 - $86.29 Grant Date Fair Value
Stock-based compensation additional disclosures
Grant date fair value of units outstanding	$ 86.29