Basis of Presentation and Accounting Policy (Tables)

6 Months Ended

Jun. 30, 2012

Nature Of Operations And Accounting Policies [Abstract]

Deferred Revenues Included In Other Current Liabilities

Deferred revenues, included in other current liabilities, for the six months ended June 30 were as follows (in thousands):

	2012			2011
Balance at beginning of period	$	9,968		$	21,045
Revenues deferred during the period	13,550			3,978
Revenues recognized during the period	(7,697		)	(8,334		)
Balance at end of period	$	15,821		$	16,689