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Fair Value of Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2016
Fair Value Disclosures [Abstract]  
Schedule of Estimated Fair Values of Financial Instruments
The estimated fair values of financial instruments are as follows (in thousands):
 
 
June 30, 2016
 
December 31, 2015
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
Financial liabilities:
 
 
 
 
 
 
 
Notes payable
$
239,390

 
$
239,390

 
$
175,181

 
$
175,181

Subordinated amortizing notes
$
10,692

 
$
8,704

 
$
14,066

 
$
12,122

5 3/4% Senior Notes due 2019
$
148,555

 
$
147,750

 
$
148,295

 
$
147,750

8 1/2% Senior Notes due 2020
$
422,872

 
$
442,000

 
$
422,896

 
$
449,438

7% Senior Notes due 2022
$
345,661

 
$
348,250

 
$
345,338

 
$
350,875