Income Tax (Narrative) (Details) (USD $)	6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Income Tax [Abstract]
Foreign withholding tax expense	$ 400,000
Credit facility				100,000,000
Change in valuation allowance on net deferred tax assets	1,007,000	373,000	13,800,000
Accrued income taxes	22,200,000
Accrued income taxes, current	13,400,000
Non-current tax liabilities	8,800,000
Accrued income taxes, current judgment	3,500,000
Increase to gross unrecognized tax benefits	100,000
Net tax balance	2,300,000
Impact of effective tax rate if recognized	1,200,000
Uncertain tax position probable changes in next 12 months, minimum	900,000
Uncertain tax position probable changes in next 12 months, maximum	$ 1,800,000