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Stock-based Compensation and Other Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | A summary of the status of the Company’s unvested RSUs as of December 31, 2017 and changes during the year then ended are presented below:
|  | Service Conditions |  | Performance and Service Conditions |  | Total |  | Weighted Average Grant-Date Fair Value Per Unit
Unvested RSUs outstanding at December 31, 2016 |  | 279,262 |  |  | 916,593 |  |  | 1,195,855 |  |  |  | $ | 38.78 |  |
Granted |  | 120,914 |  |  | 320,406 |  |  | 441,320 |  |  |  | $ | 49.62 |  |
Vested |  | (179,223 | ) |  | (525,517 | ) |  | (704,740 | ) |  |  | $ | 38.84 |  |
Forfeited |  | (13,182 | ) |  | (59,280 | ) |  | (72,462 | ) |  |  | $ | 40.82 |  |
Unvested RSUs outstanding at December 31, 2017 |  | 207,771 |  |  | 652,202 |  |  | 859,973 |  |  |  | $ | 44.29 |  |
Unvested and expected to vest RSUs outstanding at December 31, 2017 |  | 191,205 |  |  | 615,460 |  |  | 806,665 |  |  |  | $ | 44.15 |  |
Schedule of Other Share-based Compensation, Activity [Table Text Block] | The following table summarizes the balance of liability awards and expense during the years presented (in thousands):
|  | 2017 |  | 2016 |  | 2015
Balances of liability awards at beginning of year |  | $ | 465 |  |  | $ | — |  |  | $ | 1,453 |
Expense for grants |  | 470 |  |  | 465 |  |  | — |
Settled |  | (935 | ) |  | — |  |  | (1,453 | )
Balance of liability awards at end of year |  | $ | — |  |  | $ | 465 |  |  | $ | — |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] | The following summarizes pricing and term information for options outstanding as of December 31, 2017:
|  | Options Outstanding |  |  | Options Exercisable |
|  |  |  |  |  | Number Outstanding at |  | Weighted Average Remaining Contractual Life (years) |  | Weighted Average Exercise Price |  | Number Exercisable at |  | Weighted Average Exercise Price
Range of Exercise Prices |  | December 31, 2017 |  |  |  | December 31, 2017 |
$ | 4.44 |  |  | - |  | $ | 7.31 |  |  | 25,653 |  |  | 1.6 |  |  | $ | 6.25 |  |  |  | 25,653 |  |  |  | $ | 6.25 |  |
$ | 7.39 |  |  | - |  | $ | 7.39 |  |  | 3,500 |  |  | 2.3 |  |  | $ | 7.39 |  |  |  | 3,500 |  |  |  | $ | 7.39 |  |
$ | 8.26 |  |  | - |  | $ | 8.26 |  |  | 12,023 |  |  | 3.0 |  |  | $ | 8.26 |  |  |  | 12,023 |  |  |  | $ | 8.26 |  |
$ | 10.46 |  |  | - |  | $ | 10.46 |  |  | 16,494 |  |  | 3.9 |  |  | $ | 10.46 |  |  |  | 16,494 |  |  |  | $ | 10.46 |  |
$ | 16.51 |  |  | - |  | $ | 16.51 |  |  | 75,000 |  |  | 4.7 |  |  | $ | 16.51 |  |  |  | 75,000 |  |  |  | $ | 16.51 |  |
$ | 4.44 |  |  | - |  | $ | 16.51 |  |  | 132,670 |  |  | 3.8 |  |  | $ | 12.79 |  |  |  | 132,670 |  |  |  | $ | 12.79 |  |
Share-based Compensation, Stock Options, Activity [Table Text Block] | The following table is a summary of stock option activity during 2017:
|  | Non- Qualified Stock Options |  | Weighted Average Exercise Price Per Share |  | Weighted Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
Outstanding at December 31, 2016 |  | 169,919 |  |  | $ | 12.10 |  |  |  | 4.3 |  |  | $ | 5,448,000 |
Exercised |  | (36,561 | ) |  | $ | 9.60 |  |  |  |  |  |  |  |
Canceled |  | (688 | ) |  | $ | 12.19 |  |  |  |  |  |  |  |
Outstanding at December 31, 2017 |  | 132,670 |  |  | $ | 12.79 |  |  |  | 3.8 |  |  | $ | 6,830,000 |
Vested and Expected to Vest at December 31, 2017 |  | 132,670 |  |  | $ | 12.79 |  |  |  | 3.8 |  |  | $ | 6,830,000 |
Exercisable at December 31, 2017 |  | 132,670 |  |  | $ | 12.79 |  |  |  | 3.8 |  |  | $ | 6,830,000 |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] | The table below presents the average fair value per share of shares purchased and the compensation expense under the ESPP (dollars in thousands, except per share amounts):
Year Ended December 31, |  | Average fair value per share |  | Shares |  | Expense |
2017 |  | $9.71 |  | 214,466 |  | $ | 2,092 |  |
2016 |  | $9.05 |  | 242,303 |  | $ | 2,497 |  |
2015 |  | $7.77 |  | 204,401 |  | $ | 1,586 |  |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the changes in other outstanding share-based compensation awards other than stock options or nonvested awards. + 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)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited 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=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&loc=d3e5070-113901 + Details
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