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Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 15, 2018 | Sep. 22, 2017 | Oct. 11, 2016 | Sep. 27, 2012 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Common Stock Repurchase |  |  |  |  |  |  |
Repurchase of common stock authorized by Board of Directors |  |  |  | $ 100,000 |  |  |
Number of years for repurchase of common stock |  |  |  | 5 years |  |  |
Common stock repurchased, value |  |  |  |  | $ 3,546 | $ 28,958 | $ 16,500
Shares issued |  |  |  |  | 2,500 | 1,000 |
Temporary Equity, Par or Stated Value Per Share |  |  |  |  | $ 0.01 | $ 0.01 |
Liquidation preference |  |  |  |  | 20.00 |  |
Redemption price |  |  |  |  | $ 20.00 |  |
Common Stock |  |  |  |  |  |  |
Common Stock Repurchase |  |  |  |  |  |  |
Common stock repurchased (in shares) |  |  |  |  | 155,000 | 1,212,000 | 912,000
Common stock repurchased, value |  |  |  |  | $ 2 | $ 12 | $ 9
Preferred Stock [Member] |  |  |  |  |  |  |
Common Stock Repurchase |  |  |  |  |  |  |
Shares issued |  |  |  |  | 1,500,000 | 1,000,000 |
Redeemable Preferred Stock |  |  |  |  |  |  |
Common Stock Repurchase |  |  |  |  |  |  |
Shares issued |  |  | 1,000,000 |  |  |  |
Dividend rate (as a percent) |  |  | 6.50% |  |  |  |
Temporary Equity, Par or Stated Value Per Share |  |  | $ 0.01 |  |  |  |
Purchase price |  |  | $ 20.00 |  |  |  |
Net proceeds after deducting investor fees |  |  |  |  | $ 19,800 |  |
Preferred stock dividends paid |  |  |  |  | 1,300 |  |
Series A-2 Preferred Stock |  |  |  |  |  |  |
Common Stock Repurchase |  |  |  |  |  |  |
Shares issued |  | 1,500,000 |  |  |  |  |
Dividend rate (as a percent) |  | 6.50% |  |  |  |  |
Temporary Equity, Par or Stated Value Per Share |  | $ 0.01 |  |  |  |  |
Purchase price |  | $ 20.00 |  |  |  |  |
Net proceeds after deducting investor fees |  |  |  |  | $ 29,700 |  |
Preferred stock dividends paid | $ 600 |  |  |  |  |  |
Dutch Auction [Member] |  |  |  |  |  |  |
Common Stock Repurchase |  |  |  |  |  |  |
Weighted average price per share (in dollars per share) |  |  |  |  | $ 22.83 | $ 23.71 |

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- Definition Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 Reference 2: 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 Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury 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(28)) -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 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: 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 4: 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=6928386&loc=d3e21463-112644 + Details
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- Definition The per share liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control 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(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Per share amount of par value or stated value of stock classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. + 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 (27) -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 480 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764 + Details
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- Definition Amount to be paid per share that is classified as temporary equity by entity upon redemption. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (27) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The net cash inflow, (after deducting issuance related costs) from issuance of callable preferred stock which is identified as being convertible to another type of financial security at the option of the issuer or the holder. + References No definition available. + Details
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