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Debt (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Mar. 20, 2013
Wells Fargo Capital Finance, Llc [Member]
Mar. 20, 2013
Wells Fargo Capital Finance, Llc [Member]
Base Rate [Member]
Mar. 20, 2013
Wells Fargo Capital Finance, Llc [Member]
London Interbank Offered Rate (LIBOR) [Member]
Nov. 15, 2013
6.75% Notes [Member]
Mar. 20, 2013
6.75% Notes [Member]
Mar. 31, 2014
6.75% Notes [Member]
Mar. 31, 2013
6.75% Notes [Member]
Mar. 20, 2013
11% Notes [Member]
Mar. 31, 2013
11% Notes [Member]
Debt [Line Items]                        
Debt Instrument, Face Amount       $ 225,000     $ 110,000          
Debt Instrument, Interest Rate, Stated Percentage         1.25% 2.00%       6.75%   11.00%
Proceeds from Issuance of Debt             111,925 537,600        
Debt Instrument, Unamortized Premium             4,125          
Expense Related to Distribution or Servicing and Underwriting Fees             2,200          
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 5,192                      
Line of Credit Facility, Description       due 2018                
Accounts Payable, Total 27,459   34,312                  
Debt Instrument, Maturity Date               Apr. 01, 2020        
Gain (Loss) on Repurchase of Debt Instrument $ 0 $ (55,588)                 $ 55,588