Debt (Schedule Of Effective Interest Rate On LIBOR And Prime Loans Based On Average Aggregate Availability) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Over $150 [Member]
Debt Instrument [Line Items]
Average Aggregate Availability	$ 150
Under $75 [Member]
Debt Instrument [Line Items]
Average Aggregate Availability	75
ABR Spread [Member] | Over $150 [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.50%
ABR Spread [Member] | $75 - 150 [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.75%
ABR Spread [Member] | Under $75 [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.00%
Canadian Prime Spread [Member] | Over $150 [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.50%
Canadian Prime Spread [Member] | $75 - 150 [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.75%
Canadian Prime Spread [Member] | Under $75 [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.00%
Eurodollar Spread [Member] | Over $150 [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.50%
Eurodollar Spread [Member] | $75 - 150 [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.75%
Eurodollar Spread [Member] | Under $75 [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	3.00%
CDOR Spread [Member] | Over $150 [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.50%
CDOR Spread [Member] | $75 - 150 [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.75%
CDOR Spread [Member] | Under $75 [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	3.00%
LIBOR Spread [Member] | Over $150 [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.50%
LIBOR Spread [Member] | $75 - 150 [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.75%
LIBOR Spread [Member] | Under $75 [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	3.00%
Minimum [Member] | $75 - 150 [Member]
Debt Instrument [Line Items]
Average Aggregate Availability	75
Maximum [Member] | $75 - 150 [Member]
Debt Instrument [Line Items]
Average Aggregate Availability	$ 150