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Equity Method Investments (Tables)
 6 Months Ended
Jun. 30, 2017
Equity Method Investments and Joint Ventures [Abstract]  
Summary of Information Related to the Company's Equity Method Investments
Activity related to these equity method investments is as follows:
 
 
Constitution
 
Meade
 
Total
 
 
Six Months Ended June 30,
(In thousands)
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Balance at beginning of period
 
$
96,850

 
$
90,345

 
$
32,674

 
$
13,172

 
$
129,524

 
$
103,517

Contributions
 
3,125

 
6,800

 
10,501

 
11,371

 
13,626

 
18,171

Earnings (loss) on equity method investments
 
(2,555
)
 
1,937

 
(14
)
 
(2
)
 
(2,569
)
 
1,935

Balance at end of period
 
$
97,420

 
$
99,082

 
$
43,161

 
$
24,541

 
$
140,581

 
$
123,623