Recently Issued Accounting Standards Level 4 Cumulative Effect adjustment (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Dec. 31, 2010
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred acquisition costs	$ 56,903	$ 55,467	$ 6,400
Deferred income taxes	26,023	24,614	2,300
Retained Earnings (Accumulated Deficit)	$ 46,725	$ 35,150	$ 4,200