Fair Value Measurements Schedule Of Fair Value Of Assets (Details) (Fair value, measurements, recurring [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Estimate of fair value measurement [Member]
Fair Value Measurements [Line Items]
Assets measured at fair value	$ 67,057		$ 66,351
Estimate of fair value measurement [Member] | Money market funds [Member] | Cash and cash equivalents [Member]
Fair Value Measurements [Line Items]
Money market funds, included in cash and cash equivalents, fair value	50,001		50,001
Estimate of fair value measurement [Member] | Money market funds [Member] | Investments, employee benefit plans, at fair value [Member]
Fair Value Measurements [Line Items]
Mutual funds and money market funds, fair value	1,415	[1]	1,786	[1]
Estimate of fair value measurement [Member] | Mutual funds [Member] | Investments, employee benefit plans, at fair value [Member]
Fair Value Measurements [Line Items]
Mutual funds and money market funds, fair value	15,641	[1]	14,564	[1]
Fair Value, Inputs, Level 1 [Member]
Fair Value Measurements [Line Items]
Assets measured at fair value	15,641		14,564
Fair Value, Inputs, Level 1 [Member] | Money market funds [Member] | Cash and cash equivalents [Member]
Fair Value Measurements [Line Items]
Money market funds, included in cash and cash equivalents, fair value	0		0
Fair Value, Inputs, Level 1 [Member] | Money market funds [Member] | Investments, employee benefit plans, at fair value [Member]
Fair Value Measurements [Line Items]
Mutual funds and money market funds, fair value	0	[1]	0	[1]
Fair Value, Inputs, Level 1 [Member] | Mutual funds [Member] | Investments, employee benefit plans, at fair value [Member]
Fair Value Measurements [Line Items]
Mutual funds and money market funds, fair value	15,641	[1]	14,564	[1]
Fair Value, Inputs, Level 2 [Member]
Fair Value Measurements [Line Items]
Assets measured at fair value	51,416		51,787
Fair Value, Inputs, Level 2 [Member] | Money market funds [Member] | Cash and cash equivalents [Member]
Fair Value Measurements [Line Items]
Money market funds, included in cash and cash equivalents, fair value	50,001		50,001
Fair Value, Inputs, Level 2 [Member] | Money market funds [Member] | Investments, employee benefit plans, at fair value [Member]
Fair Value Measurements [Line Items]
Mutual funds and money market funds, fair value	1,415	[1]	1,786	[1]
Fair Value, Inputs, Level 2 [Member] | Mutual funds [Member] | Investments, employee benefit plans, at fair value [Member]
Fair Value Measurements [Line Items]
Mutual funds and money market funds, fair value	0	[1]	0	[1]
Fair Value, Inputs, Level 3 [Member]
Fair Value Measurements [Line Items]
Assets measured at fair value	0		0
Fair Value, Inputs, Level 3 [Member] | Money market funds [Member] | Cash and cash equivalents [Member]
Fair Value Measurements [Line Items]
Money market funds, included in cash and cash equivalents, fair value	0		0
Fair Value, Inputs, Level 3 [Member] | Money market funds [Member] | Investments, employee benefit plans, at fair value [Member]
Fair Value Measurements [Line Items]
Mutual funds and money market funds, fair value	0	[1]	0	[1]
Fair Value, Inputs, Level 3 [Member] | Mutual funds [Member] | Investments, employee benefit plans, at fair value [Member]
Fair Value Measurements [Line Items]
Mutual funds and money market funds, fair value	$ 0	[1]	$ 0	[1]

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