Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	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, 2012 Internal Revenue Service (IRS) [Member]	Dec. 31, 2010 Internal Revenue Service (IRS) [Member]	Dec. 31, 2009 Internal Revenue Service (IRS) [Member]	Dec. 31, 2012 State and Local Jurisdiction [Member]	Dec. 31, 2010 Canada Revenue Agency [Member]	Dec. 31, 2009 Canada Revenue Agency [Member]	Dec. 31, 2008 Canada Revenue Agency [Member]	Dec. 31, 2009 Debt Securities [Member]
Income Taxes [Line Items]
Deferred Tax Assets, Net of Valuation Allowance	$ 14,707,000	$ 13,095,000
Deferred Tax Assets, Valuation Allowance	(5,918,000)	(515,000)												2,300,000
Operating Loss Carryforwards							5,900,000			5,900,000
Operating Loss Carryforwards, Expiration Dates							2028			2017
Deferred Tax Assets, Tax Credit Carryforwards, Research	0	0
Tax Credit Carryforward, Amount										500,000
Liability for Uncertain Tax Positions, Current	5,523,000	5,523,000
U.S. federal statutory rate	35.00%	35.00%	35.00%
Effective income tax rate	21.50%	16.30%	24.90%
Income before income taxes, domestic operations	54,200,000	60,500,000	101,300,000
Income before income taxes, foreign operations	100,700,000	76,600,000	9,300,000
Liabilities for uncertain income tax positions	35,421,000	28,366,000
Cash paid for income taxes	20,400,000	13,500,000	35,700,000
Prepaid tax payments	9,000,000	11,000,000
Income Tax Examination, Year under Examination				2007	2006	2005		2010	2009		2010	2009	2008
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	2,300,000
Undistributed Earnings of Foreign Subsidiaries	352,900,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	3,300,000	15,800,000	2,700,000
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	7,612,000
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	(557,000)
Liability For Uncertain Income Tax Positions	$ 37,700,000