Stock Incentive Plans - Securities Vested and Expected to Vest (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019 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	666,742
Total, aggregate intrinsic value, vested | $	$ 44
Total, aggregate intrinsic value, expected to vest | $	$ 18,122
Common stock, price per share (in dollars per share) | $ / shares	$ 27.19
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 | $	$ 44
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	426,996
Aggregate intrinsic value, vested | $	$ 0
Aggregate intrinsic value, expected to vest | $	$ 11,606
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	222,999
Aggregate intrinsic value, vested | $	$ 0
Aggregate intrinsic value, expected to vest | $	$ 6,061
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	6,690
Aggregate intrinsic value, vested | $	$ 0
Aggregate intrinsic value, expected to vest | $	$ 182
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	10,057
Aggregate intrinsic value, vested | $	$ 0
Aggregate intrinsic value, expected to vest | $	$ 273