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Long-Term Debt Schedule of Long-term Debt (Tables)
 6 Months Ended
Jun. 30, 2017
Schedule of Long-term Debt Instruments [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
The following table details the Company’s long-term debt at the respective principal amounts, net of unamortized debt issuance costs:

 
June 30,
 
December 31,
 
2017
 
2016
 
2016
Senior unsecured notes:
 
 
 
 
 
5.375% senior notes due 2024 (1)
$
294,804

 
$
—

 
$
—

6.75% senior notes due 2021 (2)
—

 
196,203

 
196,545

 
$
294,804

 
$
196,203

 
$
196,545

 
 
 
 
 
 
Revolving unsecured credit facility, maturing 2022
$
97,000

 
$
50,500

 
$
260,000


(1)
As of June 30, 2017, deferred debt issuance costs of $5,196 are included as a direct deduction from the carrying amount of the senior unsecured notes due 2024 in the accompanying condensed consolidated balance sheets.

(2) 
As of June 30, 2016 and December 31, 2016, deferred debt issuance costs of $3,797 and $3,455, respectively, are included as a direct deduction from the carrying amount of the senior unsecured notes due 2021 in the accompanying condensed consolidated balance sheets.