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Restructuring and Related Charges (Tables)
 6 Months Ended
Jun. 30, 2016
Restructuring and Related Activities [Abstract]  
Schedule of restructuring and related charges
For the three and six months ended June 30, 2016 and 2015, the Company incurred charges for the Company's 2015 Restructuring Plan as follows (in thousands):
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2016

2015
 
2016
 
2015
Employee termination costs
 
$
26

 
$
560

 
$
(644
)
 
$
5,147

Relocation and other employee-related costs
 
283

 
1,885

 
539

 
3,381

Accelerated depreciation and amortization charges
 
—

 
10,853

 
—

 
20,132

Total restructuring charges
 
$
309

 
$
13,298

 
$
(105
)
 
$
28,660

The following table represents a rollforward of the liability incurred for employee termination benefits (excluding stock-based compensation) in connection with the 2015 Restructuring Plan for the six-month periods ended June 30, 2016 and 2015 (in thousands):
 
Balance at
Beginning
of Year
 
Costs Incurred
 
Changes in Estimate(1)
 
Payments and Other
 
Balance at
June 30
2016
$
11,969

 
$
—

 
$
(644
)
 
$
(6,222
)
 
$
5,103

2015
$
36,808

 
$
10,286

 
$
(4,378
)
 
$
(16,386
)
 
$
26,330

____________________
(1) 
During the six months ended June 30, 2016, changes in estimate were primarily a result of the Company's ability to reduce severance payments to former employees who obtain subsequent employment during their respective severance periods. During the six months ended June 30, 2015, changes in estimate were primarily a result of a higher number of employees accepting relocation offers than the Company initially estimated.