Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Schedule of Weighted Average Number of Shares [Table Text Block]

The following is a reconciliation between basic and diluted weighted average shares outstanding:

	Years Ended December 31,
	2014	2013	2012
Basic weighted average shares outstanding	72,000,000	71,543,000	70,374,000
Effect of dilution:
Stock options	225,000	286,000	783,000
Restricted shares/units	629,000	874,000	1,079,000
Diluted weighted average shares outstanding	72,854,000	72,703,000	72,236,000

Schedule of Stock by Class [Table Text Block]

	Shares Outstanding
	Class A  Common Stock		Class B  Common Stock
Balance at December 31, 2011	58,434,704		13,534,408
Conversion of Class B common stock to Class A common stock	1,750,000		(1,750,000	)
Employee and non-employee director stock transactions*	406,326		—
Balance at December 31, 2012	60,591,030		11,784,408
Conversion of Class B common stock to Class A common stock	300,000		(300,000	)
Employee and non-employee director stock transactions*	(96,916	)	—
Balance at December 31, 2013	60,794,114		11,484,408
Employee and non-employee director stock transactions*	(241,441	)	—
Balance at December 31, 2014	60,552,673		11,484,408

*Reflects common stock activity in connection with employee stock option exercises and restricted shares granted to employees, as well as in connection with the fulfillment of employees’ statutory tax withholding obligations for applicable income and other employment taxes and forfeited employee restricted shares.