Fair Value Measurements (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Fair Value Measurements (Details) [Line Items]
Cash and Cash Equivalents and Restricted Cash	$ 46,700,000
Restricted Cash and Cash and Cash Equivalents at Carrying Value		25,100,000
Auction Rate Securities, Noncurrent	1,900,000
Two Municipal Auction Rate Securities [Member]
Fair Value Measurements (Details) [Line Items]
Auction Rate Securities, Noncurrent	1,600,000	1,500,000
Auction Rate Securities [Member]
Fair Value Measurements (Details) [Line Items]
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax		$ 270,000