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Stockholders' Equity (Common and Preferred Stock) (Details) - $ / shares	1 Months Ended	6 Months Ended
	Oct. 31, 2006	Jun. 30, 2015	Dec. 31, 2014
Private Placement [Member]
Common Stock [Abstract]
Sale of Stock, Number of Shares Issued in Transaction	20,000,000
Sale of Stock, Price Per Share	$ 10
Preferred Stock [Member]
Preferred Stock [Abstract]
Preferred shares authorized (in shares)		8,900,000
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)		$ 0.01	$ 0.01
Maximum individual common stock ownership (in hundredths)		9.80%
Shares outstanding (in shares)		17,011,108	16,887,377
Common stock shares issued (in shares)		17,011,108	16,887,377
Common Class B [Member]
Common Stock [Abstract]
Common stock, shares authorized (in shares)		1,000
Par value (in dollars per share)		$ 0.01
Maximum individual common stock ownership (in hundredths)		9.80%

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The percentage of maximum individual common stock ownership.

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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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.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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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.

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