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Debt (Tables)
 6 Months Ended
Jun. 30, 2014
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
Long-term debt consisted of the following:
 
June 30,
 
December 31,
 
2014
 
2013
Loan Agreement
$
38,500

 
$
34,200

4.67% Senior Unsecured Notes due 2021
40,000

 
—

5.25% Senior Unsecured Notes due 2024
11,000

 
11,000

5.30% Senior Unsecured Notes due 2024
29,000

 
—

5.45% Senior Unsecured Notes due 2026
20,000

 
—

 
138,500

 
45,200

Less unamortized deferred financing fees
766

 
853

 
$
137,734

 
$
44,347