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Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Sources of deferred income taxes
Reserves, Current	$ 6,871	$ 5,908
Compensation, Current	3,332	3,481
Post-retirement benefits, Current	1,285	1,325
Pension, Current	508	342
Inventories, Current	1,447	125
Other	204	(246)
Tax carryforwards, Current	5,218	3,313
Subtotal, Current	18,865	14,248
Valuation allowance, Current	(3,233)	(1,586)
Total, Current	15,632	12,662
Reserves, Non-current	8,095	10,595
Compensation, Non-current	5,034	5,064
Post-retirement benefits, Non-current	22,642	18,467
Property, Non-current	(92,144)	(96,798)
Pension, Non-current	(14,681)	(18,190)
Other, Non-current	975	1,985
Tax carryforwards, Non-current	43,409	47,294
Subtotal, Non-current	(26,670)	(31,583)
Valuation allowance, Non-current	(27,266)	(25,946)
Total, Non-current	$ (53,936)	$ (57,529)

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