Trade Accounts Receivable, Net Of Allowances (Tables)

3 Months Ended

Mar. 31, 2012

Trade Accounts Receivable, Net Of Allowances [Abstract]

Schedule Of Unbilled Trade Accounts Receivable

(in thousands)	March 31, 2012		December 31, 2011
Trade accounts receivable	$	74,846	$	77,123
Unbilled trade accounts receivable		33,262		22,096
Total accounts receivable		108,108		99,219
Allowance for doubtful accounts		—		(31)
Allowance for sales credit memos		(1,256)		(895)
Total allowance		(1,256)		(926)
	$	106,852	$	98,293