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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2015
Income Tax Disclosure [Abstract] |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | Income tax provision consisted of the following expense/(benefit) components for the years ended December 31:
in thousands |  | 2015 |  |  | 2014 |  |  | 2013 |
Current: |  |  |  |  |  |
Federal |  | $ | 76,902 |  |  | $ | 63,266 |  |  | $ | 66,408 |
State |  | 6,567 |  |  | 4,574 |  |  | 6,849 |
Foreign |  | 188 |  |  | 76 |  |  | 190 |
Total Current |  | 83,657 |  |  | 67,916 |  |  | 73,447 |
Deferred: |  |  |  |  |  |
Federal |  | 17,317 |  |  | 20,497 |  |  | 18,220 |
State |  | 1,753 |  |  | 916 |  |  | 1,347 |
Foreign |  | 193 |  |  | 201 |  |  | (354 | )
Total Deferred |  | 19,263 |  |  | 21,614 |  |  | 19,213 |
Total |  | $ | 102,920 |  |  | $ | 89,530 |  |  | $ | 92,660 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | The reconciliation between the statutory income tax rate and the effective tax rate consisted of the following for the years ended December 31:
|  | 2015 |  |  | 2014 |  |  | 2013 |
Expected federal statutory income tax rate |  | 35.0 | % |  | 35.0 | % |  | 35.0 | %
Increase/(decrease): |  |  |  |  |  |
State and local income taxes, net of federal benefit |  | 1.8 |  |  | 1.1 |  |  | 2.2 |
Other |  | 0.9 |  |  | 1.3 |  |  | (1.0 | )
Effective tax rate (excluding noncontrolling interests) |  | 37.7 |  |  | 37.4 |  |  | 36.2 |
Income attributable to noncontrolling interests |  | (0.3 | ) |  | 0.0 |  |  | (0.4 | )
Effective tax rate per Consolidated Statements of Income |  | 37.4 | % |  | 37.4 | % |  | 35.8 | %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | The tax effects of temporary differences that gave rise to significant portions of deferred tax assets and liabilities consisted of the following at December 31:
in thousands |  | 2015 |  |  | 2014 |
Deferred Tax Assets |  |  |  |  |  |
Tax net operating loss carryforwards |  | $ | 18,109 |  |  | $ | 17,620 |
Compensation related |  | 13,130 |  |  | 13,499 |
Other |  | 6,920 |  |  | 5,206 |
Total deferred tax assets |  | 38,159 |  |  | 36,325 |
Valuation allowance |  | (17,791 | ) |  | (17,224 | )
Total deferred tax asset, net of valuation allowance |  | $ | 20,368 |  |  | $ | 19,101 |
Deferred Tax Liabilities |  |  |  |
Intangible assets |  | $ | 155,212 |  |  | $ | 134,841 |
Property and equipment |  | 7,882 |  |  | 8,319 |
Deferred sales commissions |  | 5,270 |  |  | 6,499 |
State taxes |  | 8,248 |  |  | 6,463 |
Other |  | 714 |  |  | 1,604 |
Total gross deferred tax liability |  | $ | 177,326 |  |  | $ | 157,726 |
Net deferred tax liability |  | $ | 156,958 |  |  | $ | 138,625 |

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- 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=6907707&loc=d3e32639-109319 + Details
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- 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=6907707&loc=d3e32537-109319 + Details
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- 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=6907707&loc=d3e32687-109319 + Details
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