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Stock-Based Compensation - Stock Options (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Number of Stock Options |  |  |
Balance at the beginning of the period (in shares) | 369,464 |  |
Forfeited (in shares) | (25,731) |  |
Expired (in shares) | (32,810) |  |
Balance at the end of the period (in shares) | 310,923 | 369,464 |
Exercisable at the end of the period (in shares) | 310,923 |  |
Weighted Average Exercise Price |  |  |
Balance at the beginning of the period (in dollars per share) | $ 12.70 |  |
Forfeited (in dollars per share) | 11.42 |  |
Expired (in dollars per share) | 16.79 |  |
Balance at the end of the period (in dollars per share) | 12.37 | $ 12.70 |
Exercisable at the end of the period (in dollars per share) | $ 12.37 |  |
Weighted Average Remaining Contractual Term |  |  |
Outstanding at the end of the period (in years) | 1 year 2 months 23 days |  |
Exercisable at the end of the period (in years) | 1 year 2 months 23 days |  |
Intrinsic value of outstanding options | $ 0 |  |
Options granted (in shares) | 0 | 0 | 0
Options vested (in shares) | 0 | 0 | 0
Excess tax benefits from disqualifying dispositions | $ 0 | $ 0 | $ 0
Options exercised (in shares) | 0 | 0 | 0
Proceeds from exercise of stock options | $ 0 | $ 0 | $ 0
Stock options |  |  |
Weighted Average Remaining Contractual Term |  |  |
Unrecognized compensation expense related to share-based compensation plans | $ 0 |  |

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- Definition Unrecognized cost of unvested share-based compensation 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + 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=96867065&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=96867065&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=96867065&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=96867065&loc=d3e5070-113901 + Details
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