Stock Incentive Plans - Securities Vested and Expected to Vest (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total, outstanding, vested (in shares) | shares	1,624
Total, outstanding, expected to vest (in shares) | shares	742,164
Total, aggregate intrinsic value, vested | $	$ 48
Total, aggregate intrinsic value, expected to vest | $	$ 21,790
Common stock, price per share (in dollars per share) | $ / shares	$ 29.37
2007 LTIP | Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, vested (in shares) | shares	1,624
Outstanding, expected to vest (in shares) | shares	0
Aggregate intrinsic value, vested | $	$ 48
Aggregate intrinsic value, expected to vest | $	$ 0
2010 LTIP | Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, vested (in shares) | shares	0
Outstanding, expected to vest (in shares) | shares	195,462
Aggregate intrinsic value, vested | $	$ 0
Aggregate intrinsic value, expected to vest | $	$ 5,739
2010 LTIP | Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, vested (in shares) | shares	0
Outstanding, expected to vest (in shares) | shares	127,261
Aggregate intrinsic value, vested | $	$ 0
Aggregate intrinsic value, expected to vest | $	$ 3,736
2019 LTIP | Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, vested (in shares) | shares	0
Outstanding, expected to vest (in shares) | shares	275,198
Aggregate intrinsic value, vested | $	$ 0
Aggregate intrinsic value, expected to vest | $	$ 8,080
2019 LTIP | Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, vested (in shares) | shares	0
Outstanding, expected to vest (in shares) | shares	144,243
Aggregate intrinsic value, vested | $	$ 0
Aggregate intrinsic value, expected to vest | $	$ 4,235