Share-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands |
12 Months Ended |
|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2007 |
| Weighted Average Fair Value [Roll Forward] |
|
|
|
|
| Total unrecognized compensation cost related to nonvested share-based compensation |
$ 6,785
|
|
|
|
| Cost is expected to be recognized over a weighted average period |
1 year 7 days
|
|
|
|
| Stock Options [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
| Vesting periods in equal annual installments |
3 years
|
|
|
|
| Number of Shares [Roll Forward] |
|
|
|
|
| Outstanding balance, beginning of period (in shares) |
4,440
|
|
|
|
| Exercised during the year (in shares) |
(4,440)
|
(12,913)
|
(199,002)
|
|
| Outstanding balance, end of period (in shares) |
0
|
4,440
|
|
|
| Exercisable, end of period (in shares) |
0
|
|
|
|
| Weighted Average Exercise Price [Roll Forward] |
|
|
|
|
| Outstanding balance, beginning of period (in dollars per share) |
$ 12.49
|
|
|
|
| Exercised during the year (in dollars per share) |
12.49
|
|
|
|
| Outstanding balance, end of period (in dollars per share) |
0
|
$ 12.49
|
|
|
| Exercisable, end of period (in dollars per share) |
$ 0
|
|
|
|
| Aggregate Intrinsic Value [Abstract] |
|
|
|
|
| Outstanding balance, end of period |
$ 0
|
|
|
|
| Exercisable, end of period |
$ 0
|
|
|
|
| Stock option grant in period (in shares) |
0
|
0
|
0
|
|
| Cash received from stock options exercises |
$ 0
|
$ 0
|
|
|
| Number of shares repurchased and retired as a result of non-cash exercise of stock options (in shares) |
2,290
|
7,235
|
174,090
|
|
| Stock Options [Member] | Maximum [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
| Expiration date cannot exceed |
7 years
|
|
|
|
| Restricted Awards [Member] |
|
|
|
|
| Number of Shares [Roll Forward] |
|
|
|
|
| Outstanding balance, beginning of period (in shares) |
156,331
|
|
|
|
| Granted (in shares) |
110,181
|
|
|
|
| Lapsed (in shares) |
(99,276)
|
|
|
|
| Forfeited (due to termination) (in shares) |
(5,412)
|
|
|
|
| Forfeited (due to performance payout less than 100%) (in shares) |
0
|
|
|
|
| Outstanding balance, end of period (in shares) |
161,824
|
156,331
|
|
|
| Weighted Average Fair Value [Roll Forward] |
|
|
|
|
| Outstanding balance, beginning of period (in dollars per share) |
$ 19.45
|
|
|
|
| Granted (in dollars per share) |
23.78
|
$ 20.33
|
$ 16.46
|
|
| Lapsed (in dollars per share) |
20.14
|
|
|
|
| Forfeited (due to termination) (in dollars per share) |
20.27
|
|
|
|
| Forfeited (due to performance payout less than 100%) (in dollars per share) |
0
|
|
|
|
| Outstanding balance, end of period (in dollars per share) |
$ 21.94
|
$ 19.45
|
|
|
| Total fair value of restricted stock vested |
$ 2,335
|
$ 3,608
|
$ 1,146
|
|
| Restricted Awards [Member] | Minimum [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
| Vesting periods in equal annual installments |
1 year
|
|
|
|
| Restricted Awards [Member] | Maximum [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
| Vesting periods in equal annual installments |
3 years
|
|
|
|
| Performance Awards [Member] |
|
|
|
|
| Number of Shares [Roll Forward] |
|
|
|
|
| Outstanding balance, beginning of period (in shares) |
495,005
|
|
|
|
| Granted (in shares) |
234,121
|
|
|
|
| Lapsed (in shares) |
(89,171)
|
|
|
|
| Forfeited (due to termination) (in shares) |
(60,218)
|
|
|
|
| Forfeited (due to performance payout less than 100%) (in shares) |
(121,542)
|
|
|
|
| Outstanding balance, end of period (in shares) |
458,195
|
495,005
|
|
|
| Weighted Average Fair Value [Roll Forward] |
|
|
|
|
| Outstanding balance, beginning of period (in dollars per share) |
$ 17.84
|
|
|
|
| Granted (in dollars per share) |
23.85
|
|
|
|
| Lapsed (in dollars per share) |
16.17
|
|
|
|
| Forfeited (due to termination) (in dollars per share) |
16.67
|
|
|
|
| Forfeited (due to performance payout less than 100%) (in dollars per share) |
18.61
|
|
|
|
| Outstanding balance, end of period (in dollars per share) |
$ 21.44
|
$ 17.84
|
|
|
| 2007 Incentive Plan [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
| Number of shares authorized under the plan (in shares) |
|
|
|
4,700,000
|
| Shares available to grant under the plan (in shares) |
1,333,093
|
1,677,395
|
|
|