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Cash, Cash Equivalents and Marketable Securities (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Available-for-sale Securities [Abstract]
Amortized Cost	$ 46,290,000	$ 16,878,000
Gross Unrealized Gains	51,000	29,000
Gross Unrealized Losses	(1,000)	(3,000)
Fair Value	46,340,000	16,904,000
Gain on sales of available-for-sale marketable securities	3,000	58,000	0
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Less than one year	29,077,000
One to five years	17,213,000
Amortized cost	46,290,000
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Less than one year	29,098,000
One to five years	17,242,000
Fair Value	46,340,000	16,904,000
Overnight holdings:
Money market funds (cash equivalents)	192,040,000	255,000,000
Investment holdings:
Money market funds (cash equivalents)	42,913,000	26,087,000
Marketable securities	46,340,000	16,904,000
Total cash equivalents and marketable securities	281,293,000	297,991,000
Cash held in demand accounts	23,054,000	21,732,000
Outstanding checks	(32,252,000)	(38,275,000)
Total cash, cash equivalents and marketable securities	272,095,000	281,448,000
Cash and cash equivalents	225,755,000	264,544,000	211,208,000	234,829,000
Marketable securities	46,340,000	16,904,000
Withholding associated with federal and state income taxes, employment taxes and other payroll deductions included in cash balance	143,000,000	158,200,000
Customer prepayments included in cash balance	24,459,000	13,513,000
Assets, Fair Value Disclosure [Abstract]
Fair Value	46,340,000	16,904,000
Estimate of Fair Value, Fair Value Disclosure [Member]
Available-for-sale Securities [Abstract]
Fair Value	46,340,000	16,904,000
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Fair Value	46,340,000	16,904,000
Assets, Fair Value Disclosure [Abstract]
Money market funds	234,953,000	281,087,000
Fair Value	46,340,000	16,904,000
Total	281,293,000	297,991,000
Level 1 [Member]
Available-for-sale Securities [Abstract]
Fair Value	0	0
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Fair Value	0	0
Assets, Fair Value Disclosure [Abstract]
Money market funds	234,953,000	281,087,000
Fair Value	0	0
Total	234,953,000	281,087,000
Level 2 [Member]
Available-for-sale Securities [Abstract]
Fair Value	46,340,000	16,904,000
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Fair Value	46,340,000	16,904,000
Assets, Fair Value Disclosure [Abstract]
Money market funds	0	0
Fair Value	46,340,000	16,904,000
Total	46,340,000	16,904,000
Level 3 [Member]
Available-for-sale Securities [Abstract]
Fair Value	0	0
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Fair Value	0	0
Assets, Fair Value Disclosure [Abstract]
Money market funds	0	0
Fair Value	0	0
Total	$ 0	$ 0

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- Definition

Cash equivalents include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Marketable securities include: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale which are intended to be held for less than one year or the normal operating cycle, whichever is longer.

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