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Leases (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Leases [Abstract] |  |  |
2014 (operating leases) | $ 12,537,000 |  |
2015 (operating leases) | 8,613,000 |  |
2016 (operating leases) | 6,157,000 |  |
2017 (operating leases) | 5,335,000 |  |
2018 (operating leases) | 4,936,000 |  |
After 2018 (operating leases) | 36,805,000 |  |
Total minimum lease payments (operating leases) | 74,383,000 |  |
2014 (capital leases) | 76,000 |  |
2015 (capital leases) | 76,000 |  |
2016 (capital leases) | 76,000 |  |
2017 (capital leases) | 76,000 |  |
2018 (capital leases) | 76,000 |  |
After 2018 (capital leases) | 76,000 |  |
Total minimum lease payments (capital leases) | 456,000 |  |
Rental expense for operating leases | 37,700,000 | 23,900,000 | 18,500,000
Sale Leaseback Transaction, Gross Proceeds |  | 43,800,000 |
Sale Leaseback Transaction, Lease Terms |  | P15Y |
Minimum Lease Payments, Sale Leaseback Transactions |  | 52,900,000 |
Sale Leaseback Transaction, Deferred Gain, Gross |  | $ 8,300,000 |

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- Definition Amount of minimum lease payments maturing in the next fiscal year following the latest fiscal year for capital leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Amount of minimum lease payments maturing in the forth fiscal year following the latest fiscal year for capital leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Amount of minimum lease payments maturing in the third fiscal year following the latest fiscal year for capital leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Amount of minimum lease payments maturing in the second fiscal year following the latest fiscal year for capital leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Amount of minimum lease payments for sale-leaseback transactions accounted for using the deposit method or as a financing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6456377&loc=d3e50824-112756 + Details
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