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Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2016
Derivative Instrument Detail [Abstract]  
Estimated Fair Value of Financial Instruments

Estimated fair values of our financial instruments as of December 31 are as follows: 

 

 

 

2016

 

 

2015

 

(Dollars in thousands)

 

Carrying

Amount

 

 

Fair

Value

 

 

Carrying

Amount

 

 

Fair

Value

 

Cash and cash equivalents (Level 1)

 

$

82,584

 

 

$

82,584

 

 

$

7,925

 

 

$

7,925

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Derivative assets related to interest rate

   swaps (Level 2)

 

$

1,395

 

 

$

1,395

 

 

$

581

 

 

$

581

 

Derivative liabilities related to interest rate

   swaps (Level 2)

 

$

(91

)

 

$

(91

)

 

$

—

 

 

$

—

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Long-term debt, including current portion (Level 2):

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Term Loans

 

$

(349,500

)

 

$

(350,909

)

 

$

(322,000

)

 

$

(322,000

)

Senior notes

 

 

(149,271

)

 

 

(164,250

)

 

 

(149,013

)

 

 

(165,375

)

Revenue bonds

 

 

(65,735

)

 

 

(62,205

)

 

 

(108,074

)

 

 

(108,454

)

Medium-term notes

 

 

(22,250

)

 

 

(23,926

)

 

 

(27,250

)

 

 

(29,611

)

Total long-term debt1

 

$

(586,756

)

 

$

(601,290

)

 

$

(606,337

)

 

$

(625,440

)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Company owned life insurance (COLI) (Level 3)

 

$

70

 

 

$

70

 

 

$

687

 

 

$

687

 

 

1

The carrying amount of long-term debt includes principal and unamortized discounts.