Incentive Plan - Summary of Stock Options (Details)
$ / shares in Units, $ in Thousands |
12 Months Ended |
|
Dec. 31, 2019
USD ($)
$ / shares
shares
|
|---|
| Number of Options Granted |
|
| Outstanding, beginning of period (in shares) | shares |
595,736
|
| Options granted (in shares) | shares |
0
|
| Options forfeited (in shares) | shares |
(77,702)
|
| Options exercised (in shares) | shares |
0
|
| Options expired (in shares) | shares |
(211,528)
|
| Outstanding, end of period (in shares) | shares |
306,506
|
| Exercisable, end of period (in shares) | shares |
256,867
|
| Vested or expected to vest, end of period (in shares) | shares |
49,639
|
| Weighted Average Exercise Price |
|
| Outstanding, beginning of period (in dollars per share) | $ / shares |
$ 39.23
|
| Options granted (in dollars per share) | $ / shares |
0
|
| Options forfeited (in dollars per share) | $ / shares |
39.30
|
| Options exercised (in dollars per share) | $ / shares |
0
|
| Options expired (in dollars per share) | $ / shares |
39.25
|
| Outstanding, end of period (in dollars per share) | $ / shares |
39.23
|
| Exercisable, end of period (in dollars per share) | $ / shares |
38.71
|
| Vested or expected to vest, end of period (in dollars per share) | $ / shares |
$ 41.90
|
| Weighted Average Remaining Contractual Term (Years) |
|
| Outstanding, end of period |
7 years 29 days
|
| Exercisable, end of period |
7 years 25 days
|
| Vested or expected to vest, end of period |
7 years 2 months 1 day
|
| Aggregate Intrinsic Value |
|
| Outstanding, end of period | $ |
$ 0
|
| Exercisable, end of period | $ |
0
|
| Vested or expected to vest, end of period | $ |
$ 0
|