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Stockholders' Equity (Common and Preferred Stock) (Details) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2017 Vote $ / shares shares | Dec. 31, 2016 $ / shares shares | Dec. 31, 2011 $ / shares shares
Private Placement [Member] |  |  |
Common Stock [Abstract] |  |  |
Common stock shares issued (in shares) |  |  | 20,000,000
Sale of Stock, Price Per Share | $ / shares |  |  | $ 10
Preferred Stock [Member] |  |  |
Preferred Stock [Abstract] |  |  |
Preferred shares authorized (in shares) | 8,990,000 |  |
Preferred shares issued (in shares) | 0 |  |
Common Class A [Member] |  |  |
Common Stock [Abstract] |  |  |
Common stock, shares authorized (in shares) | 100,000,000 | 100,000,000 |
Par value (in dollars per share) | $ / shares | $ 0.01 | $ 0.01 |
Common stock shares issued (in shares) | 17,614,160 | 17,502,673 |
Number of votes holder is entitled to | Vote | 1 |  |
Maximum individual common stock ownership (in hundredths) | 9.80% |  |
Common Class B [Member] |  |  |
Common Stock [Abstract] |  |  |
Common stock, shares authorized (in shares) | 1,000 |  |
Par value (in dollars per share) | $ / shares | $ 0.01 |  |
Common stock shares issued (in shares) | 0 |  |
Number of votes holder is entitled to | Vote | 1 |  |
Maximum individual common stock ownership (in hundredths) | 9.80% |  |

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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 The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + 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 Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + 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 The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + 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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