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Per Share Data and Stockholders' Equity (Details Textual) In Millions, unless otherwise specified	6 Months Ended		6 Months Ended
	Jun. 30, 2013 5.0% Convertible Senior Notes [Member]	Aug. 31, 2012 5.0% Convertible Senior Notes [Member]	Jun. 30, 2013 Common Class A [Member]	Jun. 30, 2012 Common Class A [Member]
Capital Structure and Per Share Data (Textual) [Abstract]
Stated Interest rate on debt agreement		5.00%
Antidilutive stock options excluded in computation of diluted earnings per share			0.9	1.6
Convertible senior notes maturity Year	2029

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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