Income Taxes (Narratives) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Tax Disclosures
Provision for income taxes	$ 379	$ 5,929	$ 192	$ 38,526
Income Tax Contingency [Line Items]
Open tax years by major tax jurisdiction			2009
Maximum [Member]
Income Tax Contingency [Line Items]
Open tax years by major tax jurisdiction			2012