Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Income Taxes [Line Items]
Deferred Tax Assets, Valuation Allowance	$ 0
Tax benefit from exercises and cancellations of stock options	429,000	1,121,000	3,519,000
Available-for-sale Securities, Income Tax Expense on Change in Unrealized Holding Gain (Loss)	16,000	5,000	8,000
Possible reduction in liabilities for uncertain tax positions	2,800,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	11,800,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	446,000	74,000	30,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	2,100,000	1,800,000
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount	60,500,000	63,400,000
Credit Subject To Annual Usage Limitations [Member]
Schedule of Income Taxes [Line Items]
Tax Credit Carryforward, Amount	100,000
US Federal [Member]
Schedule of Income Taxes [Line Items]
Operating Loss Carryforwards	20,200,000
Operating Loss Expiration Date, Range Start	2021
State [Member]
Schedule of Income Taxes [Line Items]
Operating Loss Carryforwards	100,000
Tax Credit Carryforward, Amount	$ 700,000
Operating Loss Expiration Date, Range Start	2015
Year One [Member]
Schedule of Income Taxes [Line Items]
Income Tax Examination, Year under Examination	2008
Year Two [Member]
Schedule of Income Taxes [Line Items]
Income Tax Examination, Year under Examination	2009