Equity (Details) - shares		12 Months Ended
		Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013
Schedule of Common Stock
Stock Issued During Period, Shares, Employee Stock Purchase Plans		24,882		6,999
Shares paid for tax withholding		62,291		11,120	8,591
Shares issued upon exercise of warrants [Member]
Schedule of Common Stock
Stock Issued During Period, Shares, Conversion of Convertible Securities				904,231	425,618
Common Class A [Member]
Schedule of Common Stock
Common Stock, Shares, Outstanding		43,614,054		42,504,656	41,971,050
Stock Issued During Period, Shares, Employee Stock Purchase Plans		24,882		6,999
Common Stock, Shares, Outstanding		43,823,739	[1]	43,614,054	42,504,656
Common Class A [Member] | Issuance of shares under employee and director compensation programs [Member]
Schedule of Common Stock
Awards vested, shares	[2]	184,803		169,933	107,988
Common Class A [Member] | Shares issued upon exercise of warrants [Member]
Schedule of Common Stock
Stock Issued During Period, Shares, Conversion of Convertible Securities				904,231	425,618
Common Class A [Member] | Conversion of class B shares [Member]
Schedule of Common Stock
Stock Issued During Period, Shares, Conversion of Convertible Securities				28,235
Class B
Schedule of Common Stock
Common Stock, Shares, Outstanding		0		28,235	28,235
Stock Issued During Period, Shares, Employee Stock Purchase Plans		0		0
Awards vested, shares		0		0	0
Common Stock, Shares, Outstanding		0		0	28,235
Class B | Shares issued upon exercise of warrants [Member]
Schedule of Common Stock
Stock Issued During Period, Shares, Conversion of Convertible Securities				0	0
Class B | Conversion of class B shares [Member]
Schedule of Common Stock
Stock Issued During Period, Shares, Conversion of Convertible Securities				(28,235)

[1] (2) In addition to the shares in the table above, there are shares of unvested restricted stock outstanding at December 31, 2015. The par value of these shares has not yet been reflected in common stock on the consolidated balance sheet, as these shares have not yet vested. There are also shares of restricted stock that were returned to treasury upon forfeiture. The par value of these shares is not reflected in the consolidated balance sheet, as no accounting recognition is given to forfeited shares. Certain unvested restricted stock is considered legally issued and outstanding and is included in the number of shares presented on the consolidated balance sheets.

[2] (1) Of these vested shares, recipients sold back to the Company 62,291, 11,120 and 8,591 shares during the years ended December 31, 2015, 2014 and 2013, respectively, to satisfy tax withholding obligations. These repurchased shares are being recognized at cost as treasury stock on the consolidated balance sheet.