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Employee Benefit Plans (Details Textual) (USD $) | 12 Months Ended |  | 6 Months Ended | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 Plan | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Plans in Red Zone [Member] | Dec. 31, 2012 Plans in Yellow Zone [Member] | Dec. 31, 2012 Plans in Green Zone [Member] | Dec. 31, 2012 Selling, General and Administrative Expenses [Member] | Dec. 31, 2011 Selling, General and Administrative Expenses [Member] | Dec. 31, 2010 Selling, General and Administrative Expenses [Member] | Dec. 31, 2012 Supplemental Employee Retirement Plans, Defined Benefit [Member] Members | Jun. 30, 2009 2004 Stock Incentive Plan [Member] Common Class A [Member] | Dec. 31, 2012 2004 Stock Incentive Plan [Member] Common Class A [Member] Executive Officer [Member] | Dec. 31, 2012 2012 Plan [Member] | Dec. 31, 2012 2012 Formula Plan [Member] | Dec. 31, 2012 2012 Formula Plan [Member] Common Class A [Member] Board Of Directors Chairman [Member] | Dec. 31, 2012 2005 Formula Restricted Stock Plan for Non-Employee Directors [Member] | Dec. 31, 2012 2004 Plan and 2012 Plan [Member] Common Class A [Member] Maximum [Member] | Dec. 31, 2012 2004 Plan and 2012 Plan [Member] Common Class A [Member] Minimum [Member] | Dec. 31, 2012 401(k) plan [Member] | Dec. 31, 2011 401(k) plan [Member] | Dec. 31, 2010 401(k) plan [Member] | Dec. 31, 2012 Stock Options [Member] 2004 Plan and 2012 Plan [Member] Common Class A [Member] | Dec. 31, 2012 Restricted Stock [Member] 2004 Stock Incentive Plan [Member] | Dec. 31, 2012 Restricted Stock [Member] 2012 Plan [Member] | Dec. 31, 2012 Non-vested restricted stock [Member] | Dec. 31, 2012 Non-vested restricted stock [Member] Restricted Stock Units R S U [Member] | Dec. 31, 2011 Non-vested restricted stock [Member] Restricted Stock Units R S U [Member] | Dec. 31, 2010 Non-vested restricted stock [Member] Restricted Stock Units R S U [Member] | Dec. 31, 2012 Non-vested restricted stock [Member] Restricted Stock Units R S U [Member] Selling, General and Administrative Expenses [Member] | Dec. 31, 2011 Non-vested restricted stock [Member] Restricted Stock Units R S U [Member] Selling, General and Administrative Expenses [Member]
Employee Benefit Plans (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employer contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,400,000 | $ 1,600,000 | $ 500,000 |  |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  | 2,000,000 | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issuable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years | 6 months |  |  |  |  | 3 years | 3 years |  |  |  |  |  |
Stock option expiration period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |
Restricted stock shares |  |  |  |  |  |  |  |  |  |  |  | 426,000 |  |  | 25,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option compensation expense |  |  |  |  |  |  | 100,000 | 400,000 | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,300,000 | 5,000,000 | 3,300,000
Tax benefits recognized related to the compensation expenses | 100,000 | 200,000 | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,900,000 | 1,200,000 | 900,000 |  |
Total compensation cost related to non-vested options not yet recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,400,000 |  |  |  |  |
Multi-Employer Benefit AI Pension Plan |  |  |  | Less than 65 percent | Between 65 and less than 80 percent | At least 80 percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total compensation cost related to non-vested options expected to be recognized over weighted average period | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year 10 months 24 days |  |  |  |  |
Members of senior management |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Benefit Plans (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of active stock compensation plans | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional terminated plans with outstanding grants | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plan vested | 0.33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of employee to make contribution under multi-employer plan | $ 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension Protection | 2006 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of employee increase / (decrease) under multi employer benefit percentage | 5.10% | 4.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total contributions of multi employer Plan |  | 5.00% | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Increase (decrease) in the percentage of the entity's employees covered by the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450673-114947 + Details
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