Share-Based Arrangements - Restricted Stock Activity (Details) - Restricted Stock Awards [Member] - $ / shares
|
3 Months Ended |
9 Months Ended |
Sep. 30, 2016 |
Sep. 30, 2016 |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |
|
|
| Restricted Stock outstanding at beginning of the period (in shares) |
178,331
|
183,543
|
| Granted (in shares) |
0
|
81,019
|
| Vested (in shares) |
(1,449)
|
(84,007)
|
| Forfeited or expired (in shares) |
(3,354)
|
(7,027)
|
| Restricted Stock outstanding at September 30, 2016 (in shares) |
173,528
|
173,528
|
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |
|
|
| Restricted Stock outstanding at Beginning of Period, Weighted-average grant date fair value (usd per share) |
$ 40.17
|
$ 37.80
|
| Granted, Weighted Average Grant Date Fair Value (usd per share) |
0.00
|
42.61
|
| Vested, Weighted Average Grant Date Fair Value (usd per share) |
42.77
|
37.88
|
| Forfeited or expired, Weighted Average Grant Date Fair Value (usd per share) |
39.85
|
39.77
|
| Restricted Stock outstanding at September 30, 2016, Weighted-average grant date fair value (usd per share) |
$ 40.16
|
$ 40.16
|