Stock Repurchase Programs (Details) - USD ($)
$ / shares in Units, $ in Thousands |
12 Months Ended |
|
|
|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Nov. 30, 2015 |
Oct. 31, 2014 |
Jul. 31, 2013 |
| Equity, Class of Treasury Stock [Line Items] |
|
|
|
|
|
|
| Shares repurchased (in shares) |
951,831
|
2,241,086
|
596,225
|
|
|
|
| Average share price (in dollars per share) |
$ 22.54
|
$ 21.87
|
$ 20.28
|
|
|
|
| Amount repurchased |
$ 21,370
|
$ 48,287
|
$ 11,336
|
|
|
|
| 2015 $25,000 Stock Repurchase Program [Member] |
|
|
|
|
|
|
| Equity, Class of Treasury Stock [Line Items] |
|
|
|
|
|
|
| Shares repurchased (in shares) |
951,831
|
154,554
|
0
|
|
|
|
| Average share price (in dollars per share) |
$ 22.54
|
$ 23.72
|
$ 0
|
|
|
|
| Amount repurchased |
$ 21,370
|
$ 3,629
|
$ 0
|
|
|
|
| Stock repurchase, authorized amount |
|
|
|
$ 25,000
|
|
|
| 2014 $50,000 Stock Repurchase Program [Member] |
|
|
|
|
|
|
| Equity, Class of Treasury Stock [Line Items] |
|
|
|
|
|
|
| Shares repurchased (in shares) |
0
|
2,086,532
|
228,525
|
|
|
|
| Average share price (in dollars per share) |
$ 0
|
$ 21.69
|
$ 23.55
|
|
|
|
| Amount repurchased |
$ 0
|
$ 44,658
|
$ 5,341
|
|
|
|
| Stock repurchase, authorized amount |
|
|
|
|
$ 50,000
|
|
| 2013 $11,500 Stock Repurchase Program [Member] |
|
|
|
|
|
|
| Equity, Class of Treasury Stock [Line Items] |
|
|
|
|
|
|
| Shares repurchased (in shares) |
0
|
0
|
367,700
|
|
|
|
| Average share price (in dollars per share) |
$ 0
|
$ 0
|
$ 16.32
|
|
|
|
| Amount repurchased |
$ 0
|
$ 0
|
$ 5,995
|
|
|
|
| Stock repurchase, authorized amount |
|
|
|
|
|
$ 11,500
|