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Debt (Details Textual) (USD $)
3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 0 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
6.75% Notes
Oct. 01, 2013
6.75% Notes
Mar. 31, 2013
6.75% Notes
Mar. 20, 2013
6.75% Notes
Jun. 30, 2014
11% Notes
Mar. 31, 2013
11% Notes
Nov. 15, 2013
6.75% Notes issued in November 2013
Mar. 20, 2013
6.75% Notes issued in November 2013
Apr. 02, 2014
6.75% Notes Issued in April 2014
Mar. 31, 2014
6.75% Notes Issued in April 2014
Jun. 30, 2014
6.75% Notes Issued in April 2014
Mar. 20, 2013
6.75% Notes Issued in April 2014
Mar. 20, 2013
Wells Fargo Capital Finance, LLC
Mar. 20, 2013
Wells Fargo Capital Finance, LLC
Base Rate
Mar. 20, 2013
Wells Fargo Capital Finance, LLC
London Interbank Offered Rate (LIBOR)
Debt [Line Items]                                        
Long-term Line of Credit, Noncurrent $ 0   $ 0   $ 0                              
Debt instrument, stated interest rate           6.75% 6.75% 6.75% 6.75% 11.00% 11.00%   6.75%       6.75%   1.25% 2.00%
Debt Instrument, Maturity Date           Apr. 01, 2020                            
Loss on redemption of notes 0 0 0 (55,588,000)           55,588,000                    
Additional borrowing face amount                       110,000,000   75,000,000            
Debt Instrument, Face Amount                                   225,000,000    
Proceeds from Offering           537,600,000           111,925,000   77,452,000            
Debt Instrument, Unamortized Premium                       4,125,000   3,938,000            
Expense Related to Distribution or Servicing and Underwriting Fees                       2,200,000   1,500,000            
Interest Paid     22,623,000 18,520,000                   14            
Debt Instrument, Redemption Date, One                               Apr. 01, 2016        
Debt Instrument, Redemption Date, Two                               Apr. 01, 2017        
Debt Instrument, Redemption Date, Latest For Redemption At Face Amount                               Apr. 01, 2018        
Debt Instrument, Percentage Of Redemption Price, Redemption Date One                               103.375%        
Debt Instrument, Percentage Of Redemption Price, Redemption Date Two                               101.688%        
Debt Instrument, Percentage Of Redemption Price, Redemption Date, Latest For Redemption At Face Amount                               100.00%        
Debt Instrument, Percentage Redeemable Redemption Date, Additional                               106.75%        
Debt Instrument, Percentage Of Redemption Price Redemption Date, Additional                             35.00%          
Debt Instrument, Percentage Of Redemption Price, Change In Ownership Control                               101.00%        
Letters of Credit Outstanding, Amount 4,990,000   4,990,000                                  
Line of Credit Facility, Description                                   2018    
Accounts Payable, Total $ 41,931,000   $ 41,931,000   $ 34,312,000