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Stock-Based Compensation and Stock Repurchases (Narrative) (Details) - USD ($) | 1 Months Ended | 12 Months Ended | 36 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016 | Sep. 30, 2016 | May 16, 2014 | Dec. 31, 2013
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restricted vesting period |  |  | 5 years |  |  |  |  |  |  |  |  |
Unrecognized estimated compensation cost related to non-vested stock options granted |  |  | $ 554,000 |  |  |  |  |  | $ 554,000 |  |  |
Recognition period of unrecognized compensation cost |  |  | 1 year 11 months 12 days |  |  |  |  |  |  |  |  |
Intrinsic unrealized value of all options outstanding, vested and expected to vest |  |  | $ 2,584,500,000 |  | $ 1,401,321,000 |  | $ 2,476,230,000 |  | 2,584,500,000 |  |  |
Cash received from exercise of stock options |  |  | 142,000,000,000 |  | 3,000,000 |  | 978,000 |  |  |  |  |
Total Paid |  |  | $ 2,850,000 | [1] | $ 3,110,000 | [1] | $ 4,070,000 | [1] | $ 10,030,000 |  |  |
Share price |  |  | $ 15.68 |  | $ 12.95 |  | $ 9.42 |  | $ 11.74 |  |  |
Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense |  |  | $ 284,000 |  | $ 282,000 |  | $ 146,000 |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense |  |  | 419,000 |  |  |  |  |  |  |  |  |
Unrecognized estimated compensation cost related to non-vested stock options granted |  |  | $ 396,000 |  |  |  |  |  | $ 396,000 |  |  |
Common Stock shares remaining for future issuances |  |  |  |  |  |  |  |  |  | 68,153 |  |
Restricted Stock Units (RSUs) [Member] | Employee/Director [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Options granted | 5,625 | 62,528 |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Vesting period of stock options and RSU |  |  | 4 years |  |  |  |  |  |  |  |  |
Percentage of shares vested |  |  | 25.00% |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Director [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Vesting period of stock options and RSU |  |  | 1 year |  |  |  |  |  |  |  |  |
Percentage of shares vested |  |  | 100.00% |  |  |  |  |  |  |  |  |
May 2014 Stock Repurchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repurchase program, amount authorized |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |
Repurchase program, shares authorized |  |  |  |  |  |  |  |  |  |  | 350,000 |
Class A Nonvoting Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock authorized for issuance under 2010 Stock Incentive Plan |  |  | 1,250,000 |  |  |  |  |  | 1,250,000 |  |  |
Common Stock shares remaining for future issuances |  |  | 604,857 |  |  |  |  |  | 604,857 |  |  |
Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Options exercised |  |  | 46,815 |  | 185,685 |  | 157,600 |  |  |  |  |
Options granted |  |  | 169,327 |  | 112,000 |  | 80,000 |  |  |  |  |
Options outstanding |  |  | 535,077 |  | 486,565 |  | 568,250 |  | 535,077 |  |  | 709,850
Class A [Member] | James Cotter Jr. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock options terminated |  |  | 50,000 |  |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Vesting period of stock options and RSU |  |  | 0 years |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Vesting period of stock options and RSU |  |  | 4 years |  |  |  |  |  |  |  |  |
[1] | Certain 2015 and 2014 balances included the restatement impact as a result of a change in accounting principle (see Note 2 - Summary of Significant Accounting Policies - Accounting Changes).

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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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