Accumulated Other Comprehensive Income (Loss) - Reclassification (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
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Realized gain (loss)	$ 0		$ 0	$ 0		$ (3,245)
Total before tax	7,862		9,511	17,712		5,086
Tax (benefit) expense	(2,279)		(3,094)	(5,152)		(255)
Income (loss) from continuing operations	5,583		6,417	12,560		4,831
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Realized gain (loss)			0			(2,723)
Tax (benefit) expense			0			1,555
Income (loss) from continuing operations			0			(1,168)
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Prior service costs	1,511	[1]	3	1,545	[1]	6
Actuarial losses	1,130	[1]	1,508	2,690	[1]	2,972
Total before tax	2,641		1,511	4,235		2,978
Tax (benefit) expense	(924)		0	(1,482)		0
Income (loss) from continuing operations	$ 1,717		$ 1,511	$ 2,753		$ 2,978

[1] These accumulated other comprehensive income components are included in the computation of net periodic pension cost. See Note 8 - "Pension Benefit and Other Postretirement Benefit Plans" for additional details.