Income Tax (Narrative) (Details) (USD $)	9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011 Australia [Member]	Jun. 30, 2011 Australia [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Withholding tax expense	$ 400,000
Credit facility				100,000,000
Change in valuation allowance on net deferred tax assets	(330,000)	(15,127,000)	13,800,000
Accrued income taxes	24,600,000
Accrued income taxes, current	14,900,000
Non-current tax liabilities	9,700,000
Accrued income taxes, current judgment	3,500,000
Net tax balance	2,100,000
Impact of effective tax rate if recognized	1,000,000
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