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Stock Based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 16, 2017 | Feb. 15, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jun. 10, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum shares of common stock provided |  |  |  |  |  | 8,700,000
Aggregate intrinsic value |  |  | $ 29,400 |  |  |
Aggregate intrinsic value exercisable |  |  | $ 13,600 |  |  |
Quoted closing market price |  |  | $ 25.76 |  |  |
Weighted average contractual term |  |  | 1 year 1 month 39 days |  |  |
Total intrinsic value of options exercised |  |  | $ 1,600 | $ 1,300 | $ 200 |
Tax related benefits realized from the exercise of stock options |  |  | 500 | 300 | 100 |
Stock-based compensation expense |  |  | 12,362 | 9,450 | 5,524 |
Stock based long term liability |  |  | 1,400 | 0 | 1,400 |
Stock based current liability |  |  | 0 | 1,000 | 0 |
Unrecognized compensation expense related to unvested stock options |  |  | $ 6,900 |  |  |
Weighted average remaining requisite service period of unvested stock awards |  |  | 1 year 10 months 24 days |  |  |
Fair value of option shares vested |  |  | $ 3,000 | 1,300 | 1,500 |
Options granted |  |  | 668,000 |  |  |
Restricted stock or unit expenses |  |  |  | 0 | 3,023 |
Aggregate intrinsic value for the restricted stock and restricted stock units outstanding |  |  | $ 28,900 |  |  |
Tax benefits recognized for stock based compensation |  |  | $ 4,300 | 3,400 | 1,900 |
Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period of shares |  |  | 3 years |  |  |
Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period of shares |  |  | 4 years |  |  |
Class A [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum shares that may be issued pursuant to options or restricted stock grants |  |  | 3,481,569 |  |  |
Restricted stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted average remaining requisite service period of unvested stock awards |  |  | 1 year 9 months 4 days |  |  |
Restricted stock or unit expenses |  |  | $ 6,600 | 4,700 | 3,000 |
Unrecognized compensation expense related to unvested restricted stock and restricted stock units |  |  | 12,500 |  |  |
Fair value of restricted stock and restricted stock units vested |  |  | $ 4,600 | 800 | 900 |
Stock options [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum vesting period |  |  | 5 years |  |  |
Maximum vesting period |  |  | 10 years |  |  |
Stock-based compensation expense |  |  | $ 5,900 | $ 4,700 | $ 2,500 |
Subsequent Event [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Options granted | 444,491 | 590,128 |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Options and Restricted Stock Grants In Period Fair Value | $ 9,300 | $ 12,400 |  |  |  |
Subsequent Event [Member] | Restricted stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period of shares | 3 years | 3 years |  |  |  |
Restricted stock grants | 174,561 | 228,174 |  |  |  |
Weighted average fair value, Granted | $ 26.86 | $ 27.26 |  |  |  |
Subsequent Event [Member] | Stock options [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period of shares | 3 years | 3 years |  |  |  |
Restricted stock grants | 174,561 | 228,174 |  |  |  |
Weighted average fair value, Granted | $ 26.86 | $ 27.26 |  |  |  |

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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable within one year (or the operating cycle, if longer). Represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20028-108363 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 25 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6409733&loc=d3e19512-108361 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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