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Stock-Based Compensation Plans (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Weighted Average Grant Date Fair Value |  |  |  |
Stock compensation expense (in dollars) |  | $ 3,717,000 | $ 4,150,000 | $ 3,509,000
The 2007 plan |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |
Balance at the beginning of the period (in dollars per share) |  | $ 17.98 | $ 13.71 | $ 13.71
Stock compensation expense (in dollars) |  | $ 3,681,000 | $ 4,102,000 | $ 3,459,000
Options cancelled (in shares) | 155,745 |  |  |
Shares granted (in dollars per share) |  | $ 21.55 | $ 18.53 | $ 19.84
Shares cancelled (in dollars per share) |  | 17.79 |  | 14.02
Shares vested (in dollars per share) |  | 17.12 | 15.87 | 13.24
Balance at the end of the period (in dollars per share) | $ 20.24 | $ 20.24 | $ 17.98 | $ 13.71
Aggregate Value |  |  |  |
Balance at the beginning of the period (in dollars) |  | $ 7,131,200 | $ 8,786,611 | $ 7,060,474
Shares granted (in dollars) |  | 2,944,941 | 2,713,159 | 4,710,362
Shares cancelled (in dollars) |  | (362,536) |  | (80,630)
Shares vested (in dollars) |  | (3,655,269) | (4,368,570) | (2,903,595)
Balance at the end of the period (in dollars) | $ 6,058,336 | 6,058,336 | 7,131,200 | 8,786,611
Employee Stock Purchase Plan |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |
Stock compensation expense (in dollars) |  | $ 36,000 | $ 48,000 | $ 50,000
Shares granted (in dollars per share) |  | $ 6.35 | $ 6.17 | $ 3.19
Aggregate Value |  |  |  |
Maximum percentage of cash compensation allowed to be deducted for the purchase of common stock by eligible employees |  | 10.00% |  |
Maximum number of shares to be purchased by employee in one calendar year |  | 1,000 |  |
Maximum amount of shares to be purchased by employee in one calendar year (in dollars) |  | $ 25,000 |  |
Purchase price expressed as a percentage of the market price of the common stock on the purchase date or on the date of entry |  | 85.00% |  |
Shares issued |  | 11,014 | 10,374 |
Restricted stock | The 2007 plan |  |  |  |
Unused Elements Abstract |  |  |  |
Intrinsic value of unvested awards issued(in dollars) | $ 7,700,000 | $ 7,700,000 |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The highest quantity of shares an employee can purchase under the plan per period. + 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=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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