Income Taxes (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 5,472,000	$ 4,511,000
Payment of withholding taxes to foreign tax authorities	5,100,000	3,800,000
Deferred Tax Assets, Gross	188,700,000
Unrecognized tax benefits	20,000,000		18,800,000
Unrecognized tax benefits, reduction of long-term deferred tax assets	18,000,000		12,600,000
Unrecognized tax benefits included in long-term income taxes payable	2,000,000		6,200,000
Portion of unrecognized tax benefits, which if recognized, would be recorded as an income tax benefit	$ 2,000,000