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Stock-Based Compensation - Performance Share Units Settled (Details) - Performance share units | 6 Months Ended
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Jun. 30, 2017 shares | Jun. 30, 2016 shares
2014 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Net Number of Issued Shares upon Vesting | 6,476 | 11,487
Shares Withheld to Settle Tax Withholding Obligations | 3,573 | 0
2014 | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
TSR Multiple Range | 0.75 | 0.63
Russell 3000 Multiple | 0 | 0
2014 | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
TSR Multiple Range | 1.00 | 0.63
Russell 3000 Multiple | 0 | 0
2015 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Net Number of Issued Shares upon Vesting | 3,869 | 13,529
Shares Withheld to Settle Tax Withholding Obligations | 2,310 | 0
2015 | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
TSR Multiple Range | 0.60 | 0.5
Russell 3000 Multiple | 0 | 0
2015 | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
TSR Multiple Range | 0.60 | 0.5
Russell 3000 Multiple | 0 | 0
2013 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Net Number of Issued Shares upon Vesting |  | 28,566
Shares Withheld to Settle Tax Withholding Obligations |  | 1,572
2013 | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
TSR Multiple Range |  | 0.63
Russell 3000 Multiple |  | 0
2013 | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
TSR Multiple Range |  | 1
Russell 3000 Multiple |  | 0

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Multiplier Earned on Total Shareholder Return + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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- Definition Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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