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GEOGRAPHIC INFORMATION - Net Sales and Long Lived Assets by Region (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales | $ 147,778 us-gaap_SalesRevenueNet | $ 118,398 us-gaap_SalesRevenueNet | $ 122,432 us-gaap_SalesRevenueNet | $ 104,168 us-gaap_SalesRevenueNet | $ 108,278 us-gaap_SalesRevenueNet | $ 105,108 us-gaap_SalesRevenueNet | $ 105,834 us-gaap_SalesRevenueNet | $ 84,950 us-gaap_SalesRevenueNet | $ 492,776 us-gaap_SalesRevenueNet | $ 404,170 us-gaap_SalesRevenueNet | $ 342,663 us-gaap_SalesRevenueNet
Long - Lived Assets | 43,669 us-gaap_NoncurrentAssets |  |  |  | 42,477 us-gaap_NoncurrentAssets |  |  |  | 43,669 us-gaap_NoncurrentAssets | 42,477 us-gaap_NoncurrentAssets | 43,807 us-gaap_NoncurrentAssets
North America |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 399,434 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | 335,969 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | 282,497 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember
Long - Lived Assets | 41,176 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember |  |  |  | 39,832 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember |  |  |  | 41,176 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | 39,832 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | 40,965 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember
Foreign |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 93,342 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = mlr_ForeignMember | 68,201 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = mlr_ForeignMember | 60,166 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = mlr_ForeignMember
Long - Lived Assets | $ 2,493 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = mlr_ForeignMember |  |  |  | $ 2,645 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = mlr_ForeignMember |  |  |  | $ 2,493 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = mlr_ForeignMember | $ 2,645 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = mlr_ForeignMember | $ 2,842 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = mlr_ForeignMember

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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