Fair Value Measurements Schedule Of Fair Value Of Assets (Details) (USD $)	Dec. 31, 2011		Dec. 31, 2010
Defined Benefit Plan, Fair Value Disclosure	$ 12,094,000		$ 0
Fair Value, Measurements, Recurring | Estimate of Fair Value, Fair Value Disclosure
Assets, Fair Value Disclosure	43,773,000		33,366,000
Fair Value, Measurements, Recurring | Estimate of Fair Value, Fair Value Disclosure | Cash and Cash Equivalents
Cash and Cash Equivalents, Fair Value Disclosure	20,001,000		10,001,000
Fair Value, Measurements, Recurring | Estimate of Fair Value, Fair Value Disclosure | Pension Plans, Defined Benefit | Mutual Funds
Defined Benefit Plan, Fair Value Disclosure	21,534,000	[1]	20,917,000	[1]
Fair Value, Measurements, Recurring | Estimate of Fair Value, Fair Value Disclosure | Pension Plans, Defined Benefit | Money Market Funds
Defined Benefit Plan, Fair Value Disclosure	2,238,000	[1]	2,448,000	[1]
Fair Value, Measurements, Recurring | Level 1
Assets, Fair Value Disclosure	21,534,000		20,917,000
Fair Value, Measurements, Recurring | Level 1 | Senior Notes [Member]
Debt Instruments, Fair Value Disclosure	267,700,000
Fair Value, Measurements, Recurring | Level 1 | Cash and Cash Equivalents
Cash and Cash Equivalents, Fair Value Disclosure	0		0
Fair Value, Measurements, Recurring | Level 1 | Pension Plans, Defined Benefit | Mutual Funds
Defined Benefit Plan, Fair Value Disclosure	21,534,000	[1]	20,917,000	[1]
Fair Value, Measurements, Recurring | Level 1 | Pension Plans, Defined Benefit | Money Market Funds
Defined Benefit Plan, Fair Value Disclosure	0	[1]	0	[1]
Fair Value, Measurements, Recurring | Level 2
Assets, Fair Value Disclosure	22,239,000		12,449,000
Fair Value, Measurements, Recurring | Level 2 | Cash and Cash Equivalents
Cash and Cash Equivalents, Fair Value Disclosure	20,001,000		10,001,000
Fair Value, Measurements, Recurring | Level 2 | Pension Plans, Defined Benefit | Mutual Funds
Defined Benefit Plan, Fair Value Disclosure	0	[1]	0	[1]
Fair Value, Measurements, Recurring | Level 2 | Pension Plans, Defined Benefit | Money Market Funds
Defined Benefit Plan, Fair Value Disclosure	2,238,000	[1]	2,448,000	[1]
Fair Value, Measurements, Recurring | Level 3
Assets, Fair Value Disclosure	0		0
Fair Value, Measurements, Recurring | Level 3 | Cash and Cash Equivalents
Cash and Cash Equivalents, Fair Value Disclosure	0		0
Fair Value, Measurements, Recurring | Level 3 | Pension Plans, Defined Benefit | Mutual Funds
Defined Benefit Plan, Fair Value Disclosure	0	[1]	0	[1]
Fair Value, Measurements, Recurring | Level 3 | Pension Plans, Defined Benefit | Money Market Funds
Defined Benefit Plan, Fair Value Disclosure	$ 0	[1]	$ 0	[1]

[1] Included in Investments, employee benefit plans, fair value on consolidated balance sheets.