Income Taxes (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Loss Carryforwards [Line Items]
Undistributed earnings of foreign subsidiaries		$ 9,500,000
Unrecognized deferred tax liability related to undistributed foreign earnings		3,300,000
Income tax benefits attributable to the exercise of employee stock options		80,000,000	4,400,000	45,500,000
Federal R&D credit recorded by the Company	3,100,000
Unrecognized tax benefits		68,231,000	43,337,000	28,133,000
Reduction in provision for income taxes due to impact of effective tax rate		57,000,000
Gross interest and penalties accrued		3,900,000	3,100,000
Other Current Assets [Member]
Operating Loss Carryforwards [Line Items]
Deferred tax assets, current		21,500,000	11,000,000
Other Noncurrent Assets [Member]
Operating Loss Carryforwards [Line Items]
Deferred tax assets, noncurrent		69,100,000	56,900,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforward amount		29,700,000
Tax credit carryforward subject to expiration		900,000
Tax credit carryforward not subject to expiration		28,800,000
Research Tax Credit Carryforward [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforward amount		$ 16,300,000