Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended	87 Months Ended
	Mar. 31, 2012 Agreement	Mar. 31, 2011	Dec. 31, 2007	Mar. 31, 2012
Discontinued Operations
Pretax earnings (loss) from results	$ (1,981)	$ 5,306
Gain on disposal, net of transaction bonus	10,203	11,056
Income tax provision	(3,225)	(6,473)
Earnings on discontinued operations, net of tax	4,997	9,889
Discontinued Operations (Textual)
Cumulative cash receipts received under ECU earn-out			150,000
Payments received under 5CP earn-out	11,336	12,284
Total payments received under the 5CP earn-out				66,327
Excess cash received under 5CP earn-out				33,226
Number of earn-out agreements	2
Cash transaction bonus payable	1,134	1,228
Pretax earnings (loss) from results	(1,981)	5,306
Pretax gains from discontinued operations related to insurance settlements		$ 7,500