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Employee Benefit Plans - Multi-Employer Plan (Details) (USD $) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  | 12 Months Ended
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Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2011 | Mar. 31, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011 Western Conference of Teamsters Pension Plan | Oct. 31, 2011 Western Conference of Teamsters Pension Plan | Jun. 30, 2013 Program for Enhanced Early Retirement | Jun. 30, 2013 Multiemployer Plans, Pension Western Conference of Teamsters Pension Plan | Jun. 30, 2012 Multiemployer Plans, Pension Western Conference of Teamsters Pension Plan | Jun. 30, 2011 Multiemployer Plans, Pension Western Conference of Teamsters Pension Plan | Jun. 30, 2013 Multiemployer Plans, Pension All Other Plans | Jun. 30, 2012 Multiemployer Plans, Pension All Other Plans | Jun. 30, 2011 Multiemployer Plans, Pension All Other Plans | Jun. 30, 2013 Other Postretirement Benefit Plans, Defined Contribution [Member] | Jun. 30, 2012 Other Postretirement Benefit Plans, Defined Contribution [Member] | Jun. 30, 2011 Other Postretirement Benefit Plans, Defined Contribution [Member]
Multiemployer Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Multiemployer Plan, Period Contributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,800,000 | $ 5,800,000 | $ 5,400,000
Employer contributions |  |  |  |  |  |  |  |  |  |  |  | 3,064,000 | [1],[2],[3] | 3,048,000 | [1],[2],[3] | 2,929,000 | [1],[2],[3] | 37,000 | [4] | 113,000 | [4] | 254,000 | [4] |  |  |
Withdrawal obligation |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employer contributions (percentage) |  |  |  |  |  |  |  |  | 5.00% |  | 6.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employer contributions (hours) |  |  |  |  |  |  |  |  |  |  | T173H |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension withdrawal expense | $ 220,000 | $ 0 | $ 4,348,000 | $ 4,348,000 | $ 4,348,000 | $ 0 | $ 4,568,000 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Individually significant plan.
[2] | Less than 5% of total contribution to WCTPP based on WCTPP's most recent annual report on Form 5500 for the calendar year ended December 31, 2012.
[3] | The Company guarantees that one hundred seventy-three (173) hours will be contributed upon for all employees who are compensated for all available straight time hours for each calendar month. An additional 6.5% of the basic contribution must be paid for PEER or the Program for Enhanced Early Retirement.
[4] | Includes plans that are not individually significant.

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- Definition Multiemployer Plans, Collective-Bargaining Arrangement, Hours of Contributions + References No definition available. + Details
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- Definition The expense for the present value of future payments related to the withdrawal from multi-employer pension plan. + References No definition available. + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -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 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a 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 -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 9 -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450691-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947 + Details
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- Definition Percentage of contributions required by a collective bargaining arrangement to contributions required by all collective bargaining arrangements related to a 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 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947 + Details
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- Definition Amount of the obligation recognized by withdrawing from a 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 No definition available. + Details
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