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Equity - Narrative (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2007 Right | Dec. 31, 2016 $ / shares shares | Sep. 30, 2016 $ / shares | Jun. 30, 2016 $ / shares | Mar. 31, 2016 $ / shares | Dec. 31, 2015 $ / shares shares | Sep. 30, 2015 $ / shares | Jun. 30, 2015 $ / shares | Mar. 31, 2015 $ / shares | Dec. 31, 2014 $ / shares | Dec. 31, 2016 $ / shares shares | Mar. 21, 2007 $ / shares
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Authorized capitalization of common stock (in shares) |  | 300,000,000 |  |  |  | 300,000,000 |  |  |  |  | 300,000,000 |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.01 |  |  |  | $ 0.01 |  |  |  |  | $ 0.01 | $ 0.01
Preferred stock, shares authorized (in shares) |  | 3,500,000 |  |  |  | 3,500,000 |  |  |  |  | 3,500,000 |
Preferred stock, par value (in dollars per share) | $ / shares |  | $ 0.01 |  |  |  | $ 0.01 |  |  |  |  | $ 0.01 |
Preferred shares issued (in shares) |  | 0 |  |  |  |  |  |  |  |  | 0 |
Number of rights per common stock share distributed as dividends | Right | 1 |  |  |  |  |  |  |  |  |  |  |
Number of shares of common stock the registered holder of each right is entitled to purchase when exercisable (in shares) |  | 1 |  |  |  |  |  |  |  |  | 1 |
Purchase price of each common stock share following the exercise of rights (in dollars per share) | $ / shares |  | $ 110.00 |  |  |  |  |  |  |  |  | $ 110.00 |
Dividends per common share (in dollars per share) | $ / shares |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 0.08 | $ 0 | $ 0 | $ 0 | $ 0.08 | $ 0 |
Number of shares authorized to be repurchased (in shares) (up to) |  | 2,400,000.0 |  |  |  |  |  |  |  |  | 2,400,000.0 |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: 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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- Definition Face amount or stated value per share of common stock. + 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 + Details
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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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