FINANCING ARRANGEMENTS (Details) (USD $)				9 Months Ended		1 Months Ended	9 Months Ended			1 Months Ended								9 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2011 Redeemable Debt Redemption Rate of 103 Percent [Member] Maximum [Member] Senior secured notes	Sep. 30, 2011 Redeemable Debt Redemption Rate of 103 Percent [Member] Senior secured notes	Sep. 30, 2011 Redeemable Debt Redemption Rate of 107.625 Percent [Member] Senior secured notes	Mar. 31, 2011 Senior secured notes	Sep. 30, 2011 Senior secured notes	Dec. 31, 2010 Senior secured notes	May 31, 2011 Revolving credit facility	May 31, 2011 Revolving credit facility Canadian subsidiaries	Sep. 30, 2011 Revolving credit facility LIBOR loans	Sep. 30, 2011 Revolving credit facility Base rate loans	May 31, 2011 Letters of credit	May 31, 2011 Letters of credit Canadian subsidiaries	May 31, 2011 Previous revolving credit facility	Sep. 30, 2011 Previous revolving credit facility LIBOR loans	Sep. 30, 2011 Previous revolving credit facility Base rate loans	Sep. 30, 2011 LIBOR loans	Sep. 30, 2011 Base rate loans
Financing arrangements
Maximum Amount Of Redeemable Debt Instruments prior to August 2012 at a Price of 103			$ 30,000,000		$ 105,000,000
Senior secured notes, at 7.625%, due on August 15, 2016							520,000,000	270,000,000
Senior secured notes, interest rate (as a percent)								7.625%
Debt Instrument, Increase, Additional Borrowings						250,000,000
Revolving credit facility, due May 31, 2016
Unamortized notes premium and discount, net							4,590,000	(5,993,000)
Long-term obligations	524,590,000	264,007,000					524,590,000	264,007,000
Revolving credit facility, maximum borrowing capacity	250,000,000								150,000,000	100,000,000			140,000,000	75,000,000	120,000,000
Purchase price of debt instrument under purchase agreement (as a percent)							104.50%
Effective yield to maturity on debt instrument (as a percent)							6.132%
Net proceeds from issuance and sale of new notes, after deducting initial purchasers' discount and estimated other transaction expenses							255,700,000
Fair-value of outstanding long-term debt							$ 540,800,000	$ 278,300,000
Maximum percentage of the aggregate principal amount of notes redeemable on or after September 29, 2011 but prior to August 15, 2012 (as a percent)				10.00%
2012 redemption price as a percentage of the principle amount (as a percent)							103.813%
2013 redemption price as a percentage of the principle amount (as a percent)							101.906%
2014 and thereafter redemption price as a percentage of the principle amount (as a percent)							100.00%
Maximum percentage of the aggregate principal amount of notes redeemable on or after September 29, 2011 but prior to August 15, 2012 (as a percent)				103.00%
Maximum percentage of the aggregate principal amount of notes redeemable prior to August 15, 2012 with net proceeds of certain equity offerings (as a percent)					35.00%
Percentage of redemption price to principle amount (as a percent)					107.625%
Percentage of principal amount at which the entity may redeem some or all of the notes prior to April 1, 2013 (as a percent)							100.00%
Percentage of principal amount at which notes may be required to be repurchased in event of change of control (as a percent)							101.00%
Percentage of principal amount at which notes may be required to be repurchased in event of sale of assets under specified circumstances (as a percent)							100.00%
Number of subsidiaries to be added as a party to the facility										1
Variable interest rate, basis																		LIBOR	BofA’s base rate
Applicable margin on variable interest rate basis, low end of range (as a percent)											1.75%	0.75%				2.25%	1.25%
Applicable margin on variable interest rate basis, high end of range (as a percent)											2.25%	1.25%				2.75%	1.75%