Stock-Based Compensation-Stock Options (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands |
12 Months Ended |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
Dec. 31, 2012 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
| Stock-based compensation costs |
$ 3,229
|
$ 1,189
|
$ 3,835
|
|
| Tax benefit from compensation expense |
$ 921
|
$ 311
|
$ 1,338
|
|
| Class A Common Stock |
|
|
|
|
| Summary of Option Activity, Shares |
|
|
|
|
| Outstanding beginning balance, Shares |
836
|
1,660
|
1,114
|
|
| Granted, Shares |
0
|
0
|
749
|
|
| Exercised, Shares |
(106)
|
(449)
|
(49)
|
|
| Forfeited or expired, Shares |
(212)
|
(375)
|
(154)
|
|
| Outstanding ending balance, Shares |
518
|
836
|
1,660
|
1,114
|
| Exercisable at end of period, Shares |
391
|
|
|
|
| Summary of Option Activity, Weighted-Average Exercise Price |
|
|
|
|
| Outstanding beginning balance, Weighted-Average Exercise Price (usd per share) |
$ 5.40
|
$ 5.57
|
$ 5.86
|
|
| Granted, Weighted-Average Exercise Price (usd per share) |
|
|
5.08
|
|
| Exercised, Weighted-Average Exercise Price (usd per share) |
5.20
|
5.11
|
5.57
|
|
| Forfeited or expired, Weighted-Average Exercise Price (usd per share) |
5.86
|
6.51
|
5.22
|
|
| Outstanding ending balance, Weighted-Average Exercise Price (usd per share) |
5.26
|
$ 5.40
|
$ 5.57
|
$ 5.86
|
| Exercisable at end of period, Weighted-Average Exercise Price (usd per share) |
$ 5.31
|
|
|
|
| Summary of Option Activity, Weighted-Average Remaining Contractual Term |
|
|
|
|
| Outstanding, Weighted-Average Remaining Contractual Term |
5 years 2 days
|
6 years 8 months 12 days
|
5 years 1 month 5 days
|
2 years 6 months
|
| Exercisable at end of period, Weighted-Average Remaining Contractual Term |
4 years 7 months 6 days
|
|
|
|
| Outstanding, Aggregate Intrinsic Value |
$ 8
|
$ 2,647
|
$ 3,517
|
$ 0
|
| Exercisable at end of period, Aggregate Intrinsic Value |
8
|
|
|
|
| Weighted average grant date fair value, options granted during period (usd per share) |
|
|
$ 1.86
|
|
| Options, exercised in period, intrinsic value |
199
|
1,622
|
$ 49
|
|
| Options, vested in period, fair value |
$ 0
|
846
|
0
|
|
| Stock options | Class A Common Stock |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
| Stock option vesting period |
3 years
|
|
|
|
| Stock option vesting per year (percent) |
33.00%
|
|
|
|
| Stock options expiration period |
10 years
|
|
|
|
| Stock option expense |
$ 25
|
$ 474
|
$ 640
|
|
| Summary of Option Activity, Weighted-Average Remaining Contractual Term |
|
|
|
|
| Unearned compensation cost |
$ 19
|
|
|
|