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Fair Value of Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2016
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, by Balance Sheet Grouping [Table Text Block]
The following table and accompanying information present the estimated fair values and classifications of our financial instruments in accordance with FASB ASC Topic 820, Fair Value Measurement, as of June 30, 2016 and December 31, 2015:
 
As of
 
June 30, 2016
 
December 31, 2015
(Amounts in thousands)
Carrying Amount
 
Fair Value
 
Carrying Amount
 
Fair Value
Financial assets (liabilities):
 

 
 

 
 

 
 

Restricted-use investment securities
$
3,518

 
$
3,518

 
$
3,036

 
$
3,036

Interest Rate Swap Agreements liabilities
(2,245
)
 
(2,245
)
 
(1,598
)
 
(1,598
)
Long-term debt (including current portion)
(1,651,957
)
 
(1,674,957
)
 
(1,505,528
)
 
(1,510,304
)