Employee Benefits Plans (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Amounts recognized in the Consolidated Balance Sheets
Noncurrent asset	$ 6,090	$ 257
Pension Plans [Member]
Amounts recognized in the Consolidated Balance Sheets
Noncurrent asset	6,090	257
Current liability	(3,309)	(3,120)
Noncurrent liability	(597,275)	(546,681)
Net amount recognized	(594,494)	(549,544)
Amounts recognized in accumulated other comprehensive loss (pre-tax)
Transition obligation	(20)	(20)
Prior service credit	(3,077)	(5,352)
Net actuarial loss	1,007,315	927,004
Net amount recognized	$ 1,004,218	$ 921,632

The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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