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Derivative Financial Instruments (Details)
 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2014
USD ($)
Jun. 30, 2013
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2013
USD ($)
Jun. 30, 2014
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Reclassification out of Accumulated Other Comprehensive Income
USD ($)
Jun. 30, 2014
Cash flow hedge
USD ($)
Jun. 30, 2014
Interest rate swap, entered in July 2005, maturity in July 2020
Cash flow hedge
USD ($)
item
Jun. 30, 2014
Interest rate swap, entered in November 2008, maturity in October 2016
Cash flow hedge
USD ($)
Jun. 30, 2014
Interest rate swap, entered in July 2012, maturity in June 2016
Cash flow hedge
USD ($)
Jun. 30, 2014
Interest rate swap, entered in July 2012, maturity in June 2016
Cash flow hedge
GBP (£)
Jun. 30, 2014
Currency swap, entered in July 2012, maturity in June 2016
Cash flow hedge
USD ($)
Jun. 30, 2014
Currency swap, entered in July 2012, maturity in June 2016
Cash flow hedge
GBP (£)
Derivative                        
Fixed Rate/Buy Amount (as a percent)             3.82% 5.95% 1.81%      
Floating/Exchange Rate Index             BMA Swap Index 1 Month LIBOR 1 Month GBP LIBOR      
Floating/Exchange Rate Index, percentage               1.50% 1.20%      
Buy (sell) amount                     $ 45,500,000 £ (7,200,000)
Notional amount             45,600,000 26,000,000   137,000,000   29,000,000
Fair value of hedge, liabilities             (6,057,000) (2,270,000) 2,576,000      
Fair value of hedge, liabilities                     (3,756,000)  
Number of interest-rate swap contracts             3          
Exchange rate USD/GBP                     1.5695  
Gains or losses recorded to accumulated other comprehensive loss reclassified to earnings 222,279,000 216,725,000 485,902,000 450,509,000 0              
Gain (loss) on cash flow hedge, ineffective portion           0            
Effects of Change in Interest Rates                        
+50 Basis Points             1,247,000 301,000 2,281,000   (578,000)  
-50 Basis Points             (1,334,000) (285,000) (2,267,000)   (82,000)  
+100 Basis Points             2,537,000 594,000 4,556,000   (825,000)  
-100 Basis Points             $ (2,624,000) $ (578,000) $ (4,541,000)   $ 166,000