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Restructuring and Related Charges (Tables)
 12 Months Ended
Dec. 31, 2017
2015 Restructuring Plan [Member]  
Restructuring Cost and Reserve [Line Items]  
Restructuring Plan and Other Restructuring Costs
The following table shows the activity in accrued restructuring and related charges for the years ended December 31, 2017, 2016, and 2015 related to our 2015 Restructuring Plan:

(In thousands)
 
Severance and Other
Employee-Related Costs
 
 
Consulting and Other Costs (1)
 
Asset Retirements
 
 
Total
Restructuring charges
 
$
8,836
 
 
$
5,074
 
 $
1,187
 
 
$
15,097
 
Payments
 
 
(825
)
 
 
(2,174
)
 
—
 
 
 
(2,999
)
Non-cash charges (2)
 
 
(918
)
 
 
—
 
 
(1,187
)
 
 
(2,105
)
Accrued restructuring and related charges liability as of December 31, 2015
 
$
7,093
 
 
$
2,900
 
 $
—
 
 
$
9,993
 
Restructuring charges
  
4,599
   
4,130
  
—
   
8,729
 
Cash payments
  
(7,414
)
  
(6,967
)
 
—
   
(14,381
)
Non-cash charges (2)
  
67
   
—
  
—
   
67
 
Adjustments (3)
  
(103
)
  
—
  
—
   
(103
)
Accrued restructuring and related charges liability as of December 31, 2016
 
$
4,242
  
$
63
 
$
—
  
$
4,305
 
Payments
  
(1,434
)
  
(11
)
 
—
   
(1,445
)
Accrued restructuring and related charges liability as of December 31, 2017
 
$
2,808
  
$
52
 
$
—
  
$
2,860
 
 
(1) Consulting and other costs primarily consist of third-party consulting charges. Consulting and other costs also include approximately $0.2 million and $0.4 million of lease termination costs in 2016 and 2015, respectively.
 
(2) Non-cash charges consist primarily of share-based compensation costs as well as asset retirements.  

(3) Adjustments resulted primarily from actual employee tax and benefit amounts differing from previous estimates.
2016 Restructuring Plan [Member]  
Restructuring Cost and Reserve [Line Items]  
Restructuring Plan and Other Restructuring Costs
The following table shows the activity in accrued restructuring and related charges for the years ended December 31, 2016 and 2017 related to our 2016 Restructuring Plan:
 
(In thousands)
 
Severance and Other
Employee-Related Costs
 
 
Consulting and Other
Costs (1)
 
Total
 
Restructuring charges
 
$
4,697
 
 
$
236
 
$
4,933
   
Payments
 
 
(559
)
 
 
(188
)
 
(747
)
  
Non-cash charges (2)
  
(287
)
  
—
  
(287
)
  
Accrued restructuring and related charges liability as of December 31, 2016
 
$
3,851
 
 
$
48
 
$
3,899
 
  
Restructuring charges
 
$
795
 
 
$
16
 
$
811
   
Payments
 
 
(3,399
)
 
 
(64
)
 
(3,463
)
  
Adjustments (3)
  
(159
)
  
—
  
(159
)
  
Accrued restructuring and related charges liability as of December 31, 2017
 
$
1,088
 
 
$
—
 
$
1,088
 
  
 
(1) Consulting and other costs consist of third-party consulting charges. 
 
(2) Non-cash charges consist of share-based compensation costs. 
 
(3) Adjustments consist primarily of actual employee tax and benefit amounts differing from previous estimates. 
2017 Restructuring Plan [Member]  
Restructuring Cost and Reserve [Line Items]  
Restructuring Plan and Other Restructuring Costs
The following table shows the activity in accrued restructuring and related charges for the year ended December 31, 2017 related to our 2017 Restructuring Plan:

(In thousands)
 
Severance and Other
Employee-Related Costs
 
Restructuring charges
 
$
2,571
 
Payments
 
 
(540
)
Non-cash charges (1)
  
(108
)
Accrued restructuring and related charges liability as of December 31, 2017
 
$
1,923
 
 
(1) Non-cash charges consist of share-based compensation costs.