Stockholders Equity and Stock-Based Compensation (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 02, 2014
Stockholders Equity and Stock-Based Compensation [Line Items]
Treasury Stock, Shares	244,113	244,113
Class B Share Convertible to Class A Share	1
Preferred Stock, Shares Authorized	20,000,000
Preferred Stock, Par Value Per Share	$ 0.01
Preferred Stock, Shares Outstanding	0	0
Annual Percentage Increase In Number Of Shares Available For Issuance	1.50%
Share Based Compensation Arrangement By Share Based Payment Additional Shares Made Available				557,894
Remaining Aggregate Number of Shares Authorized For Issuance	3,521,356
Stock Compensation Expense	$ 5,200,000	$ 8,100,000	$ 9,200,000
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount	0	0	0
Share-based Compensation, Tax Deficiency from Exercise of Stock Options, Vested Cancellations and Vesting of Restricted Stock	2,332,000	1,361,000	236,000
Share-based Compensation Arrangement by Share-based Award, Award Vesting Period	3 years	3 years	3 years
Contractual Life Of Option Grants	5 years	5 years	5 years
Expected Annual Cash Dividend	$ 0.84
Granted, Number of Shares	957,525	986,650	986,000
Granted, Weighted Average Exercise Price	$ 27.42	$ 29.24	$ 38.56
Granted, Weighted Average Fair Value	$ 4.84	$ 5.19	$ 9.14
Share-based Payment Award, Options, Vested, Fair Value	6,100,000	8,300,000	7,800,000
Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 5,500,000
Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 7 months
Restricted Stock Granted to Employees [Member]
Stockholders Equity and Stock-Based Compensation [Line Items]
Share-based Compensation Arrangement by Share-based Award, Award Vesting Period	3 years	3 years	3 years
Restricted Stock Granted to Board of Directors [Member]
Stockholders Equity and Stock-Based Compensation [Line Items]
Share-based Compensation Arrangement by Share-based Award, Award Vesting Period	1 year	1 year	1 year
Class A Common Stock [Member]
Stockholders Equity and Stock-Based Compensation [Line Items]
Common Stock, Shares Authorized	150,000,000	150,000,000
Common Stock, Par Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Outstanding	24,001,780	23,849,719
Common Stock, Voting Rights	1
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Issued and Outstanding Under The Plan	4,616,309
Class B Common Stock [Member]
Stockholders Equity and Stock-Based Compensation [Line Items]
Common Stock, Shares Authorized	50,000,000	50,000,000
Common Stock, Par Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Outstanding	13,192,845	13,192,845
Common Stock, Voting Rights	10
Maximum [Member]
Stockholders Equity and Stock-Based Compensation [Line Items]
Contractual Life Of Option Grants	8 years	8 years	8 years
Going Private Transaction [Member] | Class A Common Stock [Member]
Stockholders Equity and Stock-Based Compensation [Line Items]
Common Stock, Voting Rights	1
Going Private Transaction [Member] | Class B Common Stock [Member]
Stockholders Equity and Stock-Based Compensation [Line Items]
Common Stock, Voting Rights	1