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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The following summarizes the assumptions used in determining the fair value of stock options granted for fixed awards with graded vesting schedules during the year ended December 31, 2013:
|  | 2013
Risk-free interest rate |  |  | 1.0% |
Expected dividend yield |  |  | 0.0% |
Weighted average expected volatility |  |  | 50% |
Expected term |  |  | 6.0 years |
Weighted average grant-date fair value |  | $ | 11.74 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | Following is a summary of stock option activity for the three-year period ending December 31, 2015:
|  | Options |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term |  | Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2013 |  |  | 1,432,228 |  |  | $ | 10.34 |  |  |  |  |  |  |  |  |
Granted |  |  | 111,147 |  |  | $ | 24.68 |  |  |  |  |  |  |  |  |
Exercised |  |  | (390,652 | ) |  | $ | 5.90 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (4,003 | ) |  | $ | 20.28 |  |  |  |  |  |  |  |  |
Expired |  |  | (1,400 | ) |  | $ | 15.96 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2013 |  |  | 1,147,320 |  |  | $ | 13.21 |  |  |  | 5.1 years |  |  | $ | 13,623 |
Exercised |  |  | (134,273 | ) |  | $ | 7.93 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (2,838 | ) |  | $ | 22.66 |  |  |  |  |  |  |  |  |
Expired |  |  | (1,428 | ) |  | $ | 24.26 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2014 |  |  | 1,008,781 |  |  | $ | 13.87 |  |  |  | 4.2 years |  |  | $ | 13,652 |
Exercised |  |  | (267,440 | ) |  | $ | 7.19 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (1,290 | ) |  | $ | 23.14 |  |  |  |  |  |  |  |  |
Expired |  |  | (9,446 | ) |  | $ | 5.92 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2015 |  |  | 730,605 |  |  | $ | 16.40 |  |  |  | 3.6 years |  |  | $ | 3,722 |
Exercisable at December 31, 2015 |  |  | 698,303 |  |  | $ | 16.01 |  |  |  | 3.4 years |  |  | $ | 3,722 |
Schedule of Cash Proceeds Received from Share-based Payment Awards [Table Text Block] | Other data relating to option activity for the years ended December 31 are as follows:
(dollars in thousands) |  | 2015 |  | 2014 |  | 2013
Intrinsic value of options exercised |  | $ | 5,857 |  |  | $ | 2,383 |  |  | $ | 6,878 |
Fair value of options vested |  |  | 948 |  |  |  | 1,187 |  |  |  | 1,047 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] | The following table summarizes information with respect to stock options outstanding and exercisable under the Company’s plans at December 31, 2015:
|  | Options Outstanding |  | Options Exercisable
Exercise Price |  | Number Of Options |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term |  | Number Of Options |  | Weighted- Average Exercise Price
$3.65 – $9.00 |  |  | 42,923 |  |  | $ | 3.90 |  |  |  | 0.6 years |  |  |  | 42,923 |  |  | $ | 3.90 |
$9.01 – $18.00 |  |  | 497,116 |  |  | $ | 14.62 |  |  |  | 3.2 years |  |  |  | 497,116 |  |  | $ | 14.62 |
$18.01 – $24.68 |  |  | 190,566 |  |  | $ | 23.85 |  |  |  | 5.1 years |  |  |  | 158,264 |  |  | $ | 23.68 |
|  |  | 730,605 |  |  | $ | 16.40 |  |  |  | 3.6 years |  |  |  | 698,303 |  |  | $ | 16.01 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | Following is a summary of restricted stock activity for the three-year period ending December 31, 2015:
|  | Shares |  | Per Share Weighted- Average Grant Date Fair Value
Outstanding unvested at January 1, 2013 |  |  | 185,764 |  |  | $ | 19.54 |
Granted |  |  | 76,590 |  |  | $ | 24.48 |
Vested |  |  | (48,513 | ) |  | $ | 19.50 |
Forfeited |  |  | (2,125 | ) |  | $ | 20.03 |
Outstanding unvested at December 31, 2013 |  |  | 211,716 |  |  | $ | 21.33 |
Granted |  |  | 82,351 |  |  | $ | 24.46 |
Vested |  |  | (64,657 | ) |  | $ | 20.85 |
Forfeited |  |  | (9,073 | ) |  | $ | 21.34 |
Outstanding unvested at December 31, 2014 |  |  | 220,337 |  |  | $ | 22.64 |
Granted |  |  | 83,236 |  |  | $ | 29.21 |
Vested |  |  | (102,297 | ) |  | $ | 22.42 |
Forfeited |  |  | (3,131 | ) |  | $ | 24.10 |
Outstanding unvested at December 31, 2015 |  |  | 198,145 |  |  | $ | 24.48 |
Schedule of Nonvested Performance-based Units Activity [Table Text Block] | Following is a summary of performance share award activity for the three-year period ending December 31, 2015:
|  | Shares |  | Per Share Weighted- Average Grant Date Fair Value
Outstanding at January 1, 2013 |  |  | 74,923 |  |  | $ | 20.51 |
Granted at target |  |  | 46,106 |  |  | $ | 24.68 |
Earned for performance above target |  |  | 11,281 |  |  | $ | 24.18 |
Vested |  |  | (45,116 | ) |  | $ | 24.18 |
Outstanding at December 31, 2013 |  |  | 87,194 |  |  | $ | 21.29 |
Granted at target |  |  | 85,078 |  |  | $ | 27.69 |
Earned for performance above target |  |  | 25,292 |  |  | $ | 17.48 |
Vested |  |  | (65,237 | ) |  | $ | 17.48 |
Forfeited |  |  | (5,524 | ) |  | $ | 24.84 |
Outstanding at December 31, 2014 |  |  | 126,803 |  |  | $ | 26.63 |
Granted at target |  |  | 69,978 |  |  | $ | 38.70 |
Forfeited for performance below target |  |  | (3,810 | ) |  | $ | 24.68 |
Vested |  |  | (40,474 | ) |  | $ | 24.68 |
Forfeited |  |  | (8,889 | ) |  | $ | 30.87 |
Outstanding at December 31, 2015 |  |  | 143,608 |  |  | $ | 32.68 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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