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Bank Debt, Long-Term Debt and Convertible Notes (Details Textual)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Nov. 26, 2009
CAD
Dec. 31, 2012
Wells Fargo Capital Finance, LLC [Member]
Dec. 10, 2012
Eleven Percentage Notes [Member]
USD ($)
Apr. 19, 2011
Eleven Percentage Notes [Member]
USD ($)
May 14, 2010
Eleven Percentage Notes [Member]
USD ($)
Oct. 23, 2009
Eleven Percentage Notes [Member]
USD ($)
Dec. 31, 2012
Eleven Percentage Notes [Member]
Interest Expense, Debt $ 44,045 $ 39,044 $ 30,429              
Interest Expense, Amortization of Debt Discount   232 848              
Interest Expense, Amortization of Debt Premium 1,366 943 197              
Interest Expense, Present Value Adjustments for Fixed Deferred Acquisition Payments 277 702 922              
Interest Income (Expense), Net 46                  
Amortization of Financing Costs 2,295 1,944 1,288              
Aggregate principal amount, issued           80,000 55,000 65,000 225,000  
Debt Instrument, Interest Rate, Stated Percentage           11.00% 11.00% 11.00% 11.00%  
Debt Instrument, Maturity Date           Nov. 01, 2016 Nov. 01, 2016 Nov. 01, 2016 Nov. 01, 2016  
Proceeds from Issuance of Debt           83,200 59,580 67,208 208,881  
Debt Instrument, Unamortized Discount, Percentage                 4.70%  
Debt Instrument, Unamortized Discount                 10,494  
Debt Instrument, Unamortized Premium           4,800 6,050 2,600    
Expense Related to Distribution or Servicing and Underwriting Fees           1,600 1,470 392 5,624  
Redeemed of Convertible Debt       45,000            
Debt instrument redemption date one                   Nov. 01, 2013
Debt instrument redemption date two                   Nov. 01, 2014
Debt Instrument, Redemption Date, Latest for Redemption at Face Amount                   Nov. 01, 2015
Debt Instrument, Percentage of Redemption Price, Redemption Date One                   105.50%
Debt Instrument, Percentage of Redemption Price, Redemption Date Two                   102.75%
Debt Instrument, Percentage of Redemption Price, Redemption Date, Latest for Redemption at Face Amount                   100.00%
Debt Instrument, Percentage Redeemable Redemption Date, Additional                   35.00%
Debt Instrument, Percentage of Redemption Price Redemption Date, Additional                   11.00%
Debt Instrument, Percentage of Redemption Price, Change in Ownership Control                   101.00%
Letters of Credit Outstanding, Amount 4,771 5,830                
Checks Outstanding $ 29,336 $ 3,350                
Credit Agreement, Description         On October 23, 2009, the Company and its subsidiaries entered into a $75,000 five year senior secured revolving WF Credit Agreement (the "WF Credit Agreement") with Wells Fargo Foothill, LLC, as agent, and the lenders from time to time party thereto. On November 22, 2010, this agreement was amended to increase the availability under the facility to $100,000. On April 2011, the Company entered into an additional amendment to increase the availability under the facility to $150,000 and extend the maturity date to October 23, 2015.          
Line of Credit Facility, Description         The WF Credit Agreement replaced the Company's existing $185,000 senior secured financing agreement with Fortress Credit Corp., as collateral agent, Wells Fargo Foothill, Inc., as administrative agent. Advances under the WF Credit Agreement will bear interest as follows: (a)(i) LIBOR Rate Loans bear interest at the LIBOR Rate and (ii) Base Rate Loans bear interest at the Base Rate, plus (b) an applicable margin. The initial applicable margin for borrowing is 2.25% in the case of Base Rate Loans and 2.50% in the case of LIBOR Rate Loans. The applicable margin may be reduced subject to the Company achieving certain trailing twelve month earning levels, as defined. In addition to paying interest on outstanding principal under the WF Credit Agreement, the Company is required to pay an unused revolver fee to lenders under the WF Credit Agreement in respect of unused commitments thereunder.          
Amendment To Credit Agreement         On July 30, 2012, the Company entered into a further amendment to the WF Credit Agreement. This most recent amendment provides that the Company's Total Leverage Ratio (as defined), measured on a quarter-end basis, must be no greater than 4.0x, for the twelve-month period ending September 30, 2012 and for the twelve-month period ending on the last day of each calendar quarter thereafter.