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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2016
Goodwill and Other Intangible Assets [Abstract]  
Changes in the carrying amount of goodwill
The changes in the carrying amount of goodwill by segment were as follows:

(In thousands)
 
Piping Systems
  
Industrial Metals
  
Climate
  
Total
 
 
            
   Goodwill
 
$
141,132
  
$
8,853
  
$
2,329
  
$
152,314
 
   Accumulated impairment charges
  
(40,552
)
  
(8,853
)
  
—
   
(49,405
)
 
                
Balance at December 27, 2014:
  
100,580
   
—
   
2,329
   
102,909
 
 
                
Additions
  
19,087
   
1
   
2,087
   
21,175
 
Disposition
  
(2,418
)
  
—
   
—
   
(2,418
)
Currency translation
  
(1,414
)
  
—
   
—
   
(1,414
)
 
                
Balance at December 26, 2015: 
  
115,835
   
1
   
4,416
   
120,252
 
 
                
Additions (1)
  
4,601
   
—
   
—
   
4,601
 
Currency translation
  
(860
)
  
—
   
—
   
(860
)
                 
Balance at December 31, 2016:
                
   Goodwill
  
160,128
   
8,854
   
4,416
   
173,398
 
   Accumulated impairment charges
  
(40,552
)
  
(8,853
)
  
—
   
(49,405
)
 
                
Goodwill, net
 
$
119,576
  
$
1
  
$
4,416
  
$
123,993
 
 
                
(1) Includes finalization of the purchase price allocation adjustment for Great Lakes of $4.1 million
 
Carrying amount of intangible assets
The carrying amount of intangible assets at December 31, 2016 was as follows:

 
(In thousands)
 
Gross Carrying Amount
  
Accumulated Amortization
  
Net Carrying Amount
 
 
         
Customer relationships
 
$
29,833
  
$
(2,845
)
 
$
26,988
 
Non-compete agreements
  
5,926
   
(4,063
)
  
1,863
 
Patents and technology
  
5,922
   
(1,179
)
  
4,743
 
Trade names and licenses
  
4,087
   
(1,032
)
  
3,055
 
Other
  
213
   
(694
)
  
(481
)
 
            
Other intangible assets
 
$
45,981
  
$
(9,813
)
 
$
36,168
 
 
The carrying amount of intangible assets at December 26, 2015 was as follows:

 
(In thousands)
 
Gross Carrying Amount
  
Accumulated Amortization
  
Net Carrying Amount
 
 
         
Customer relationships
 
$
30,882
  
$
(1,488
)
 
$
29,394
 
Non-compete agreements
  
6,534
   
(2,838
)
  
3,696
 
Patents and technology
  
9,798
   
(5,323
)
  
4,475
 
Trade names and licenses
  
4,160
   
(574
)
  
3,586
 
Other
  
213
   
(728
)
  
(515
)
 
            
Other intangible assets
 
$
51,587
  
$
(10,951
)
 
$
40,636
 
Amortization expense for intangible assets
Amortization expense for intangible assets was $4.3 million in 2016, $4.1 million in 2015, and $3.5 million in 2014.  Future amortization expense is estimated as follows:

(In thousands)
 
Amount
 
 
   
2017
 
$
2,996
 
2018
  
2,735
 
2019
  
2,655
 
2020
  
2,458
 
2021
  
2,272
 
Thereafter
  
23,052
 
 
    
Expected amortization expense
 
$
36,168