Non-operating (loss) income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Non-operating (loss) income, net [Abstract]
Interest and Dividend Income, Securities	$ 620	$ 605	$ 1,263	$ 905
Unrealized Gain (Loss) on Derivatives	1,996	(3,147)	(4,437)	(3,960)
Income From Transition Services Agreements	0	1,086	0	2,179
Realized Investment Gains (Losses)	3,018	31	3,051	36
Other Nonoperating Income (Expense)	527	(672)	507	(450)
Nonoperating (loss) Income	$ 6,161	$ (2,097)	$ 384	$ (1,290)