XML 64 R48.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Income Taxes (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2016
Income Tax Disclosure [Abstract] |
Components of Income (Loss) Before Taxes from Continuing Operations | The components of income (loss) before taxes from continuing operations consisted of the following for the years ended December 31 (in thousands):
| 2016 |  | 2015 |  | 2014
Domestic | $ | 37,316 |  |  | $ | 40,176 |  |  | $ | (87,179 | )
Foreign | 12,667 |  |  | (3,076 | ) |  | 2,429 |
Income (loss) before taxes from continuing operations | $ | 49,983 |  |  | $ | 37,100 |  |  | $ | (84,750 | )
Summary of Provision for Income Taxes for Continuing Operations | The provision for (benefit of) income taxes from continuing operations for the years ended December 31 consisted of the following (in thousands):
| 2016 |  | 2015 |  | 2014
Current: |  |  |  |  |
U.S. Federal | $ | 14,703 |  |  | $ | 12,294 |  |  | $ | 1,684 |
State | 2,987 |  |  | 2,010 |  |  | 1,265 |
Foreign | 3,467 |  |  | 1,371 |  |  | 733 |
Total current | 21,157 |  |  | 15,675 |  |  | 3,682 |
Deferred: |  |  |  |  |
U.S. Federal | (5,404 | ) |  | (178 | ) |  | (6,373 | )
State | 1,595 |  |  | 273 |  |  | (203 | )
Foreign | (1,084 | ) |  | (2,146 | ) |  | (64 | )
Total deferred | (4,893 | ) |  | (2,051 | ) |  | (6,640 | )
Provision for income taxes | $ | 16,264 |  |  | $ | 13,624 |  |  | $ | (2,958 | )
(Benefit of) Provision for Income Taxes from Discontinued Operations | The (benefit of) provision for income taxes from discontinued operations for the years ended December 31 consisted of the following (in thousands):
| 2016 |  | 2015 |  | 2014
Current: |  |  |  |  |
U.S. Federal | $ | (24 | ) |  | $ | (15 | ) |  | $ | (18 | )
State | (2 | ) |  | (1 | ) |  | (1 | )
Foreign | — |  |  | — |  |  | — |
(Benefit of) provision for income taxes | $ | (26 | ) |  | $ | (16 | ) |  | $ | (19 | )
Provision for Income Taxes from Continuing Operations Differs from the Federal Statutory Rate | The provision for income taxes from continuing operations differs from the federal statutory rate of 35% for the years ended December 31 due to the following (in thousands):
| 2016 |  | 2015 |  | 2014
Statutory rate | $ | 17,494 |  |  | 35.0 | % |  | $ | 12,985 |  |  | 35.0 | % |  | $ | (29,664 | ) |  | 35.0 | %
Intangible asset impairment | 341 |  |  | 0.7 | % |  | — |  |  | — | % |  | 26,637 |  |  | (31.4 | )%
State taxes, less federal effect | 3,033 |  |  | 6.1 | % |  | 1,845 |  |  | 5.0 | % |  | 606 |  |  | (0.7 | )%
Change in valuation allowance | 685 |  |  | 1.4 | % |  | 284 |  |  | 0.7 | % |  | 94 |  |  | (0.1 | )%
Non-deductible expenses | 556 |  |  | 1.1 | % |  | 2 |  |  | — | % |  | 233 |  |  | (0.3 | )%
Federal tax credits | (439 | ) |  | (0.9 | )% |  | (242 | ) |  | (0.7 | )% |  | (255 | ) |  | 0.3 | %
Uncertain tax positions | (154 | ) |  | (0.3 | )% |  | (344 | ) |  | (0.9 | )% |  | (169 | ) |  | 0.2 | %
Foreign rate differential | (677 | ) |  | (1.4 | )% |  | (6 | ) |  | — | % |  | (311 | ) |  | 0.4 | %
Worthless stock deduction | (868 | ) |  | (1.7 | )% |  | — |  |  | — | % |  | — |  |  | — | %
Domestic manufacturer's deduction | (1,363 | ) |  | (2.7 | )% |  | (795 | ) |  | (2.1 | )% |  | (60 | ) |  | 0.1 | %
Intercompany debt discharge | (2,389 | ) |  | (4.8 | )% |  | — |  |  | — | % |  | — |  |  | — | %
Other | 45 |  |  | — | % |  | (105 | ) |  | (0.3 | )% |  | (69 | ) |  | — | %
| $ | 16,264 |  |  | 32.5 | % |  | $ | 13,624 |  |  | 36.7 | % |  | $ | (2,958 | ) |  | 3.5 | %
Deferred Tax Liabilities (Assets) | Deferred tax liabilities (assets) at December 31 consist of the following (in thousands):
| 2016 |  | 2015
Depreciation | $ | 17,367 |  |  | $ | 18,667 |
Goodwill | 43,562 |  |  | 36,058 |
Intangible assets | 14,731 |  |  | 19,291 |
Other | 892 |  |  | 1,742 |
Gross deferred tax liabilities | 76,552 |  |  | 75,758 |
Equity compensation | (21,439 | ) |  | (13,023 | )
Other | (18,473 | ) |  | (20,847 | )
Gross deferred tax assets | (39,912 | ) |  | (33,870 | )
Valuation allowances | 1,362 |  |  | 766 |
Deferred tax assets, net of valuation allowances | (38,550 | ) |  | (33,104 | )
Net deferred tax liabilities | $ | 38,002 |  |  | $ | 42,654 |
Summary of Valuation Allowance | The following sets forth a reconciliation of the beginning and ending amount of the Company’s valuation allowance (in thousands):
| 2016 |  | 2015 |  | 2014
Balance as of January 1 | $ | 766 |  |  | $ | 400 |  |  | $ | 306 |
Cost charged to the tax provision | 983 |  |  | 286 |  |  | 144 |
Reductions | (338 | ) |  | (78 | ) |  | (50 | )
Purchase accounting adjustment and divestiture | — |  |  | 158 |  |  | — |
Currency translation | (49 | ) |  | — |  |  | — |
Balance as of December 31 | $ | 1,362 |  |  | $ | 766 |  |  | $ | 400 |
Income Taxes Paid, Net of Tax Refunds | The Company made net payments for income taxes for the following amounts for the years ended December 31 (in thousands):
| 2016 |  | 2015 |  | 2014
Payments made for income taxes, net | $ | (17,700 | ) |  | $ | (11,879 | ) |  | $ | (6,509 | )
Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):
| 2016 |  | 2015 |  | 2014
Balance as of January 1 | $ | 3,876 |  |  | $ | 1,414 |  |  | $ | 1,694 |
Additions for tax positions of the current year | 33 |  |  | 148 |  |  | 180 |
Additions for tax positions of prior years | — |  |  | 2,955 |  |  | 93 |
Reductions for tax positions of prior years for: |  |  |  |  |
Settlements and changes in judgment | (256 | ) |  | (331 | ) |  | (154 | )
Lapses of applicable statute of limitations | — |  |  | (310 | ) |  | (399 | )
Divestitures and foreign currency translation | (187 | ) |  | — |  |  | — |
Balance as of December 31 | $ | 3,466 |  |  | $ | 3,876 |  |  | $ | 1,414 |
Interest (Net of Federal Tax Benefit) and Penalties Recognized | Interest (net of federal tax benefit) and penalties recognized during the years ended December 31 were (in thousands):
| 2016 |  | 2015 |  | 2014
Interest and penalties recognized as income | $ | (122 | ) |  | $ | (87 | ) |  | $ | (28 | )

X
- Definition Income taxes paid and net of tax refunds [Table Text Block]. + References No definition available. + Details
Name: | rock_IncomeTaxesPaidAndNetOfTaxRefundsTableTextBlock
Namespace Prefix: | rock_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Interest (net of federal tax benefit) and penalties recognized [Table Text Block] + References No definition available. + Details
Name: | rock_InterestNetOfFederalTaxBenefitAndPenaltiesRecognizedTableTextBlock
Namespace Prefix: | rock_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule Of Components Of Income Tax Expense Benefit For Discontinued Operations. + References No definition available. + Details
Name: | rock_ScheduleOfComponentsOfIncomeTaxExpenseBenefitForDiscontinuedOperationsTableTextBlock
Namespace Prefix: | rock_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 + Details
Name: | us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
Name: | us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
Name: | us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of income before income tax between domestic and foreign jurisdictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_ScheduleOfIncomeBeforeIncomeTaxDomesticAndForeignTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32840-109319 + Details
Name: | us-gaap_SummaryOfIncomeTaxContingenciesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of valuation allowances to reduce deferred tax assets to net realizable value, including identification of the deferred tax asset more likely than not will not be fully realized and the corresponding amount of the valuation allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Valuation Allowance -URI http://asc.fasb.org/extlink&oid=6528051 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
Name: | us-gaap_SummaryOfValuationAllowanceTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration