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Debt (Tables)
6 Months Ended
Jun. 30, 2015
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Long-term debt consisted of the following:
 
June 30,
 
December 31,
 
2015
 
2014
Loan Agreement
$
101,977

 
$
137,109

4.67% Senior Unsecured Notes due 2021
40,000

 
40,000

5.25% Senior Unsecured Notes due 2024
11,000

 
11,000

5.30% Senior Unsecured Notes due 2024
29,000

 
29,000

5.45% Senior Unsecured Notes due 2026
20,000

 
20,000

 
201,977

 
237,109

Less unamortized deferred financing fees
592

 
680

 
$
201,385

 
$
236,429