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Litigation, Other Commitments and Contingencies, and Disclosures about Guarantees (Tables)
 6 Months Ended
Jun. 30, 2015
Other Commitments [Line Items]  
Equity Investments with an Imputed Interest Rate
The following table contains the disclosures required by the authoritative guidelines for equity investments with a 6% imputed interest rate: 
(THOUSANDS)
 
Equity contributions
 
Principal payment schedule above:
$
9,043

Less: unamortized discount
594

Total
$
8,449
NMTC [Member]  
Other Commitments [Line Items]  
Other Commitments
The following table reflects remaining future equity contributions:
(THOUSANDS)
CONTRIBUTION

Six months ending Dec. 31, 2015
$
3,629

Years ending Dec. 31,
 

2016
2,707

2017
2,707

Total
$
9,043