Stockholders' Equity and Equity Instruments - Activity (Details)
|
9 Months Ended |
|
Sep. 30, 2017
$ / shares
shares
|
|---|
| Stock Options [Member] |
|
| Number |
|
| Outstanding at beginning of period (in shares) |
442,755
|
| Granted (in shares) |
227,351
|
| Exercised (in shares) |
(3,366)
|
| Cancelled/Expired (in shares) |
(80,606)
|
| Outstanding at end of period (in shares) |
586,134
|
| Weighted-average exercise price |
|
| Weighted-average exercise price at beginning of period (in dollars per share) | $ / shares |
$ 80.07
|
| Weighted-average exercise price, Granted (in dollars per share) | $ / shares |
68.00
|
| Weighted-average exercise price, Exercised (in dollars per share) | $ / shares |
76.03
|
| Weighted-average exercise price, Cancelled/Expired (in dollars per share) | $ / shares |
76.05
|
| Weighted-average exercise price at end of period (in dollars per share) | $ / shares |
$ 75.97
|
| RSUs [Member] |
|
| Number |
|
| Outstanding at beginning of period (in shares) |
63,780
|
| Granted (in shares) |
34,635
|
| Released from restriction (in shares) |
(15,806)
|
| Cancelled/Expired (in shares) |
(9,906)
|
| Outstanding at end of period (in shares) |
72,703
|
| Weighted-average fair value |
|
| Weighted-average fair value at beginning of period (in dollars per share) | $ / shares |
$ 80.25
|
| Weighted-average fair value, Granted (in dollars per share) | $ / shares |
68.00
|
| Weighted-average fair value, Released from restriction (in dollars per share) | $ / shares |
84.77
|
| Weighted-average fair value, Cancelled/Expired (in dollars per share) | $ / shares |
71.54
|
| Weighted-average fair value at end of period (in dollars per share) | $ / shares |
$ 74.62
|
| PSUs [Member] |
|
| Number |
|
| Outstanding at beginning of period (in shares) |
89,011
|
| Granted (in shares) |
58,878
|
| Released from restriction (in shares) |
(12,946)
|
| Cancelled/Expired (in shares) |
(19,416)
|
| Outstanding at end of period (in shares) |
115,527
|
| Weighted-average fair value |
|
| Weighted-average fair value at beginning of period (in dollars per share) | $ / shares |
$ 89.43
|
| Weighted-average fair value, Granted (in dollars per share) | $ / shares |
73.08
|
| Weighted-average fair value, Released from restriction (in dollars per share) | $ / shares |
105.77
|
| Weighted-average fair value, Cancelled/Expired (in dollars per share) | $ / shares |
88.18
|
| Weighted-average fair value at end of period (in dollars per share) | $ / shares |
$ 79.47
|
| PSU at grant date (in shares per unit) |
1
|
| PSUs [Member] | 2014 Grant [Member] |
|
| Number |
|
| Cancelled/Expired (in shares) |
(6,900)
|