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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning Balance     $ 5,171,000 $ (6,757,000)
Other comprehensive income before reclassification     (11,896,000) 60,084,000
Amounts reclassified from accumulated other comprehensive (loss) income     (12,522,000) 0
Other comprehensive income $ (3,210,000) $ 61,938,000 (24,418,000) 60,084,000
Ending Balance (19,247,000) 53,327,000 (19,247,000) 53,327,000
Unrealized gain (loss) on available-for-sale securities        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning Balance     15,751,000 7,796,000
Other comprehensive income before reclassification     (11,477,000) 58,333,000
Amounts reclassified from accumulated other comprehensive (loss) income     (12,906,000)  
Other comprehensive income     (24,383,000) 58,333,000
Ending Balance (8,632,000) 66,129,000 (8,632,000) 66,129,000
Pension and post-retirement benefit plan adjustments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning Balance     (15,251,000) (12,731,000)
Other comprehensive income before reclassification     0 0
Amounts reclassified from accumulated other comprehensive (loss) income     0  
Other comprehensive income     0 0
Ending Balance (15,251,000) (12,731,000) (15,251,000) (12,731,000)
Gains (losses) on cash flow hedges        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning Balance     4,042,000 (2,676,000)
Other comprehensive income before reclassification     0 1,963,000
Amounts reclassified from accumulated other comprehensive (loss) income     384,000  
Other comprehensive income     384,000 1,963,000
Ending Balance 4,426,000 (713,000) 4,426,000 (713,000)
Share of affiliates' comprehensive income        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning Balance     629,000 854,000
Other comprehensive income before reclassification     (419,000) (212,000)
Amounts reclassified from accumulated other comprehensive (loss) income     0  
Other comprehensive income     (419,000) (212,000)
Ending Balance $ 210,000 $ 642,000 $ 210,000 $ 642,000