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Stock Compensation Plans (Stock Appreciation Rights) (Details) - Stock Appreciation Rights (SARs) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |
Number of shares outstanding at beginning of period | 1,183,024 |
Number of shares granted | 0 | 1,400,000
Number of shares exercised | (916,874) |
Number of shares canceled and expired | 0 |
Number of shares outstanding at end of period | 266,150 |
Number of shares vested and expected to vest | 266,150 |
Number of shares exercisable | 266,150,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |
Weighted average exercise price outstanding at beginning of period | $ 3.53 |
Weighted average exercise price granted | 0.00 |
Weighted average exercise price exercised | 3.53 |
Weighted average exercise price canceled and expired | 0.00 |
Weighted average exercise price outstanding at end of period | 3.53 |
Weighted average exercise price, vested and expected to vest | 3.53 |
Weighted average exercise price, exercisable | $ 3.53 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] |  |
Weighted average remaining life, outstanding | 1 year 1 month 2 days |
Weighted average remaining life, vested and expected to vest | 1 year 1 month 2 days |
Weighted average remaining life, exercisable | 1 year 1 month 2 days |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract] |  |
Intrinsic value outstanding | $ 0 |
Intrinsic value, vested and expected to vest | $ 0 |
Intrinsic value, exercisable | $ 0 |

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- Definition Amount of difference between fair value of the underlying equity instrument for the issuance and exercise price of vested portions of equity instruments outstanding and currently exercisable. + References No definition available. + Details
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- Definition The weighted-average remaining life in years, for excercisable equity instruments other than options. + References No definition available. + Details
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- Definition Amount of difference between fair value of the underlying equity instruments reserved for issuance and exercise price of equity instruments outstanding. + References No definition available. + Details
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- Definition The weighted-average remaining life in years, for equity instruments other than options vested and expected to vest. + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested, other than stock (or unit) option plans outstanding as of the balance sheet date can be currently converted under the option plan. + References No definition available. + Details
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- Definition The weighted-average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References No definition available. + 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 canceled and expired options under the stock option plan. + References No definition available. + 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 exercised options under the stock option plan. + References No definition available. + Details
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- Definition The number of exercises made 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 No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition Per share weighted average intrinsic value of equity-based compensation awards vested. Excludes stock and unit 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 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and 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 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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