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Equity Compensation Plans - Options (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) item $ / shares shares | Dec. 31, 2015 $ / shares shares | Dec. 31, 2014 shares | May 31, 2016 shares
Equity Compensation Plans |  |  |  |
Number of stock option grant awards outstanding | item | 2 |  |  |
Term of stock options granted | 10 years |  |  |
Vesting period | 3 years |  |  |
Shares |  |  |  |
Exercised (in shares) | $ | $ (11,000) |  |  |
Ending outstanding (in dollars) | $ | $ 32,040,000 |  |  |
2009 Plan |  |  |  |
Equity Compensation Plans |  |  |  |
Shares issued | 16,500 |  |  |
Shares |  |  |  |
Ending outstanding (in shares) | 9,000 |  |  |
2007 Plan |  |  |  |
Equity Compensation Plans |  |  |  |
Shares issued | 93,000 |  |  |
Shares |  |  |  |
Ending outstanding (in shares) | 85,500 |  |  |
Incentive Plan |  |  |  |
Equity Compensation Plans |  |  |  |
Number of shares authorized | 1,908,332 |  |  |
Stock options |  |  |  |
Equity Compensation Plans |  |  |  |
Exercised (in shares) |  | 0 | 0 |
Total unrecognized compensation cost | $ | $ 0 |  |  |
Shares |  |  |  |
Beginning outstanding (in shares) | 162,500 |  |  |
Canceled (in shares) | (36,500) |  |  |
Expired (in shares) | (30,000) |  |  |
Exercised (in shares) | $ | $ (1,500) |  |  |
Ending outstanding (in shares) | 94,500 | 162,500 |  |
Exercised (in dollars) | $ | $ 2,790,000 |  |  |
Exercisable at end of period (in shares) | 94,500 |  |  |
Weighted Average Exercise Price |  |  |  |
Beginning outstanding (in dollars per share) | $ / shares | $ 27.03 |  |  |
Canceled (in dollars per share) | $ / shares | 29.20 |  |  |
Expired (in dollars per share) | $ / shares | 29.20 |  |  |
Exercised (in dollars per share) | $ / shares | 7.49 |  |  |
Ending outstanding (in dollars per share) | $ / shares | 25.82 | $ 27.03 |  |
Exercisable at end of period (in dollars per share) | $ / shares | $ 25.82 |  |  |
Weighted Average Remaining Contractual Term (years) |  |  |  |
Ending outstanding (in years) | 1 year 1 month 6 days |  |  |
Exercisable at end of period | 1 year 1 month 6 days |  |  |
Stock options | 2014 Plan |  |  |  |
Equity Compensation Plans |  |  |  |
Number of shares authorized |  |  | 375,000 | 975,000
Stock options | 2009 Plan |  |  |  |
Equity Compensation Plans |  |  |  |
Exercised (in shares) | (1,500) |  |  |

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(4) -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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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 Number of options outstanding, including both vested and non-vested options. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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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