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Supplemental Financial Information (Schedule of Consolidating Balance Sheets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Schedule Of Supplemental Financial Information [Line Items]              
Cash and cash equivalents $ 210,743   $ 222,280 $ 182,379 $ 170,177 $ 182,379 $ 170,177
Accounts receivable, net 171,642 $ 150,307 145,385        
Intercompany balances 0   0        
Inventories 95,694 81,637 86,372        
Other current assets 11,594   8,727        
Total current assets 489,673 462,951 462,764        
Property, plant, and equipment, net 93,221   97,098        
Goodwill 320,875   321,074        
Acquired intangibles 101,554   105,768        
Other assets 4,597   4,681        
Investment in subsidiaries 0   0        
Total assets 1,009,920 991,572 991,385        
Accounts payable 88,547   82,387        
Accrued expenses 65,174 75,380 75,467        
Billings in excess of cost 15,527   12,779        
Current maturities of long-term debt 400   400        
Total current liabilities 169,648 170,946 171,033        
Long-term debt 209,613   209,621        
Deferred income taxes 31,196   31,237        
Other non-current liabilities 38,567   47,775        
Total shareholders’ equity 560,896 531,993 531,719        
Total liabilities and shareholders' equity 1,009,920 $ 991,572 991,385        
Reportable Legal Entities | Guarantor Subsidiaries              
Schedule Of Supplemental Financial Information [Line Items]              
Cash and cash equivalents 181,879   192,604     158,843 143,826
Accounts receivable, net 164,357   138,903        
Intercompany balances 4,505   4,166        
Inventories 91,611   82,457        
Other current assets 5,708   (368)        
Total current assets 448,060   417,762        
Property, plant, and equipment, net 90,333   93,906        
Goodwill 298,258   298,258        
Acquired intangibles 93,367   97,171        
Other assets 4,597   4,681        
Investment in subsidiaries 62,074   61,746        
Total assets 996,689   973,524        
Accounts payable 84,166   77,786        
Accrued expenses 56,377   67,746        
Billings in excess of cost 13,028   9,840        
Current maturities of long-term debt 400   400        
Total current liabilities 153,971   155,772        
Long-term debt 850   1,100        
Deferred income taxes 28,928   28,907        
Other non-current liabilities 38,567   47,775        
Total shareholders’ equity 774,373   739,970        
Total liabilities and shareholders' equity 996,689   973,524        
Reportable Legal Entities | Non-Guarantor Subsidiaries              
Schedule Of Supplemental Financial Information [Line Items]              
Cash and cash equivalents 28,864   29,676     23,536 26,351
Accounts receivable, net 7,285   6,482        
Intercompany balances (3,285)   (4,490)        
Inventories 4,083   3,915        
Other current assets 3,911   3,680        
Total current assets 40,858   39,263        
Property, plant, and equipment, net 2,888   3,192        
Goodwill 22,617   22,816        
Acquired intangibles 8,187   8,597        
Other assets 0   0        
Investment in subsidiaries 0   0        
Total assets 74,550   73,868        
Accounts payable 4,381   4,601        
Accrued expenses 3,328   2,252        
Billings in excess of cost 2,499   2,939        
Current maturities of long-term debt 0   0        
Total current liabilities 10,208   9,792        
Long-term debt 0   0        
Deferred income taxes 2,268   2,330        
Other non-current liabilities 0   0        
Total shareholders’ equity 62,074   61,746        
Total liabilities and shareholders' equity 74,550   73,868        
Reportable Legal Entities | Gibraltar Industries, Inc.              
Schedule Of Supplemental Financial Information [Line Items]              
Cash and cash equivalents 0   0     0 0
Accounts receivable, net 0   0        
Intercompany balances (1,220)   324        
Inventories 0   0        
Other current assets 1,975   5,415        
Total current assets 755   5,739        
Property, plant, and equipment, net 0   0        
Goodwill 0   0        
Acquired intangibles 0   0        
Other assets 0   0        
Investment in subsidiaries 774,373   739,970        
Total assets 775,128   745,709        
Accounts payable 0   0        
Accrued expenses 5,469   5,469        
Billings in excess of cost 0   0        
Current maturities of long-term debt 0   0        
Total current liabilities 5,469   5,469        
Long-term debt 208,763   208,521        
Deferred income taxes 0   0        
Other non-current liabilities 0   0        
Total shareholders’ equity 560,896   531,719        
Total liabilities and shareholders' equity 775,128   745,709        
Eliminations              
Schedule Of Supplemental Financial Information [Line Items]              
Cash and cash equivalents 0   0     $ 0 $ 0
Accounts receivable, net 0   0        
Intercompany balances 0   0        
Inventories 0   0        
Other current assets 0   0        
Total current assets 0   0        
Property, plant, and equipment, net 0   0        
Goodwill 0   0        
Acquired intangibles 0   0        
Other assets 0   0        
Investment in subsidiaries (836,447)   (801,716)        
Total assets (836,447)   (801,716)        
Accounts payable 0   0        
Accrued expenses 0   0        
Billings in excess of cost     0        
Current maturities of long-term debt 0   0        
Total current liabilities 0   0        
Long-term debt 0   0        
Deferred income taxes 0   0        
Other non-current liabilities 0   0        
Total shareholders’ equity (836,447)   (801,716)        
Total liabilities and shareholders' equity $ (836,447)   $ (801,716)