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Retirement Plans And Postretirement Benefits (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 years | Dec. 31, 2012 | Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of increase in salaries based on the final average wages | 6.00% |  |
Percentage of equity in GTI | 50.00% |  |
Option to remain in defined benefit plan for an additional period, in years | 5 years |  |
Percentage of quarterly contributions to each employee's total eligible pay | 1.00% |  |
Pension and other postretirement benefit contributions | $ 0.9 | $ 1.0 | $ 0.8
Defined benefit plan, accumulated benefit obligation | 213.2 | 230.1 |
Employee retirement age, years | 65 |  |
Prior service credit from stockholders' equity | 0.2 |  |
Assets of trust approximately | 5.3 | 4.3 |
Common stock held in employee benefit and compensation trusts, shares | 87,206 | 76,095 |
Basic contribution to savings plan by employees in percentage | 5.00% |  |
Additional basic contribution to savings plan by employees in percentage | 45.00% |  |
Stock issued during period, shares, employee savings plan | 553,298 | 433,496 | 186,237
Stock issued during period, value, employee benefit plan | $ 4.6 | $ 4.6 | $ 3.3
U.S. [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investment plan percentage | 100.00% |  |
First Of Employee Contribution [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Units of fund that invest in our common stock | 100.00% |  |
Employee contribution percent | 3.00% |  |
Next of Employee Contribution [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Units of fund that invest in our common stock | 50.00% |  |
Employee contribution percent | 2.00% |  |
Equity Securities [Member] | U.S. [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investment plan percentage | 20.00% |  |
Investment plan maximum | 100.00% |  |
Fixed Income Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investment plan percentage | 100.00% |  |
Fixed Income Securities [Member] | U.S. [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investment plan percentage | 80.00% |  |

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- Definition Number of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-6 -Paragraph 14 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6418455&loc=d3e16701-113920 + Details
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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920 + Details
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- Definition The amount of cash or cash equivalents contributed during the reporting period by the entity to fund its pension plans and its non-pension postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585 + Details
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