Shareholders' Equity Accumulated OCI Reclassified to Statement of Operations (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	$ (70)		$ (68)		$ (74)
Other Amounts Recognized in Other Comprehensive Income, before tax	658		0		1
Income (loss) before income taxes	(148,254)		136,219		(501,766)
Income Tax Expense (Benefit)	3,664		(25,995)		(4,430)
Net income (loss)	(144,590)		110,224		(506,196)
Total reclassifications for the period, net of tax	(144,590)		110,224		(506,196)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)	(1,379)	[1]	(168)	[1]	(17)	[1]
Total reclassifications for the period, net of tax	(1,379)	[1]	(168)	[1]	(17)	[1]
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(70)	[1],[2]	(68)	[1],[2]	(74)	[1],[2]
Defined Benefit Plan, Amortization of Gains (Losses)	(926)	[1],[2]	(161)	[1],[2]	85	[1],[2]
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements	(325)	[1],[2]	(13)	[1],[2]	(25)	[1],[2]
Other Amounts Recognized in Other Comprehensive Income, before tax	(658)	[1],[2]	0	[1],[2]	0	[1],[2]
Income (loss) before income taxes	(1,979)	[1]	(242)	[1]	(14)	[1]
Income Tax Expense (Benefit)	600	[1]	74	[1]	(3)	[1]
Net income (loss)	(1,379)	[1]	(168)	[1]	(17)	[1]
Total reclassifications for the period, net of tax	$ (1,379)	[1]	$ (168)	[1]	$ (17)	[1]

[1] Amounts in parenthesis indicate debits to the Statements of Operations.

[2] These AOCI components are included in the computation of net periodic pension cost. Refer to Note 8 for additional details.