Stockholders' Equity (Details) $ / shares in Units, $ in Millions |
3 Months Ended | 9 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Nov. 04, 2016
$ / shares
|
Sep. 15, 2016
USD ($)
|
Aug. 08, 2016
$ / shares
|
Jun. 15, 2016
USD ($)
|
May 25, 2016 |
May 09, 2016
$ / shares
|
Mar. 28, 2016
USD ($)
|
Feb. 24, 2016
$ / shares
|
Sep. 30, 2016
USD ($)
$ / shares
shares
|
Sep. 30, 2015
USD ($)
$ / shares
shares
|
Sep. 30, 2016
USD ($)
$ / shares
shares
|
Sep. 30, 2015
USD ($)
$ / shares
shares
|
|
| Subsequent Event [Line Items] | ||||||||||||
| Stock split | 2 | |||||||||||
| Dividends per share (in dollars per share) | $ / shares | $ 0.08 | $ 0.08 | $ 0.08 | $ 0.08 | $ 0.07 | $ 0.24 | $ 0.20 | |||||
| Cash payment amount | $ | $ 3.8 | $ 3.7 | $ 3.8 | $ 11.3 | $ 9.1 | |||||||
| Common stock available for future share repurchases, amount | $ | $ 4.3 | $ 4.3 | ||||||||||
| Common stock repurchased, number of shares repurchased (in shares) | shares | 99,210 | 99,022 | 188,126 | 296,838 | ||||||||
| Common stock repurchased, average price per share (in dollars per share) | $ / shares | $ 37.77 | $ 30.30 | $ 38.52 | $ 30.32 | ||||||||
| Common stock repurchased, total repurchase costs | $ | $ 3.7 | $ 3.0 | $ 7.2 | $ 9.0 | ||||||||
| Subsequent Event | ||||||||||||
| Subsequent Event [Line Items] | ||||||||||||
| Dividends per share (in dollars per share) | $ / shares | $ 0.09 | |||||||||||