Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2011 California Franchise Tax Board [Member]	Dec. 31, 2010 California Franchise Tax Board [Member]	Dec. 31, 2009 California Franchise Tax Board [Member]	Dec. 31, 2007 California Franchise Tax Board [Member]	Dec. 31, 2006 California Franchise Tax Board [Member]	Dec. 31, 2005 California Franchise Tax Board [Member]	Dec. 31, 2013 Internal Revenue Service (IRS) [Member]	Dec. 31, 2011 Internal Revenue Service (IRS) [Member]	Dec. 31, 2010 Internal Revenue Service (IRS) [Member]	Dec. 31, 2009 Internal Revenue Service (IRS) [Member]	Dec. 31, 2013 State and Local Jurisdiction [Member]	Dec. 31, 2011 Canada Revenue Agency [Member]	Dec. 31, 2010 Canada Revenue Agency [Member]	Dec. 31, 2009 Illinois Department of Revenue [Member]	Dec. 31, 2008 Illinois Department of Revenue [Member]	Dec. 31, 2011 New York City Department of Finance [Member]	Dec. 31, 2010 New York City Department of Finance [Member]	Dec. 31, 2009 New York City Department of Finance [Member]
Income Taxes [Line Items]
Deferred Tax Assets, Net of Valuation Allowance	$ 21,685,000	$ 14,707,000
Deferred Tax Assets, Valuation Allowance	(8,493,000)	(5,918,000)
Operating Loss Carryforwards										22,900,000				700,000
Operating Loss Carryforwards, Expiration Dates										Dec. 31, 2028				Dec. 31, 2030
Deferred Tax Assets, Tax Credit Carryforwards, Research	900,000	0
Tax Credit Carryforward, Amount														500,000
Liability for Uncertain Tax Positions, Current	5,535,000	5,523,000
U.S. federal statutory rate	35.00%	35.00%	35.00%
Effective income tax rate	24.70%	21.50%	16.30%
Income before income taxes, domestic operations	61,000,000	54,200,000	60,500,000
Income before income taxes, foreign operations	81,700,000	100,700,000	76,600,000
Liabilities for uncertain income tax positions	40,888,000	35,421,000
Cash paid for income taxes	28,300,000	20,400,000	13,500,000
Prepaid tax payments	11,300,000	9,000,000
Income Tax Examination, Year under Examination				2011	2010	2009	2007	2006	2005		2011	2010	2009		2011	2010	2009	2008	2011	2010	2009
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	3,000,000
Undistributed Earnings of Foreign Subsidiaries	389,500,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	7,100,000	3,300,000	15,800,000
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	7,113,000
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	(1,646,000)
Liability For Uncertain Income Tax Positions	$ 43,900,000