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Business Segments and Customer Information, Major Customers (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | $ 471,638 | $ 546,755 | $ 580,762
Percentage of revenue by customer (in dollars per share) | 100.00% | 100.00% | 100.00%
U.S. Navy [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 123,307 | 120,867 | 140,551
Percentage of revenue by customer (in dollars per share) | 26.10% | 22.10% | 24.20%
U.S. Army/Army Reserve [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 101,736 | 182,412 | 231,615
Percentage of revenue by customer (in dollars per share) | 21.60% | 33.40% | 39.90%
U.S. Air Force [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 3,625 | 6,963 | 11,971
Percentage of revenue by customer (in dollars per share) | 0.80% | 1.30% | 2.00%
Total Department of Defense [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 228,668 | 310,242 | 384,137
Percentage of revenue by customer (in dollars per share) | 48.50% | 56.80% | 66.10%
U.S. Postal Service [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 142,203 | 130,866 | 75,964
Percentage of revenue by customer (in dollars per share) | 30.10% | 23.90% | 13.10%
Department of U.S. Treasury [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 35,929 | 33,369 | 41,434
Percentage of revenue by customer (in dollars per share) | 7.60% | 6.10% | 7.10%
Department of Energy [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 20,124 | 20,898 | 23,010
Percentage of revenue by customer (in dollars per share) | 4.30% | 3.80% | 4.00%
Department of Interior [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 1,545 | 16,884 | 24,254
Percentage of revenue by customer (in dollars per share) | 0.30% | 3.10% | 4.20%
Other government [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 40,919 | 32,231 | 28,160
Percentage of revenue by customer (in dollars per share) | 8.70% | 5.90% | 4.80%
Total Federal civilian agencies [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 240,720 | 234,248 | 192,822
Percentage of revenue by customer (in dollars per share) | 51.00% | 42.80% | 33.20%
Commercial [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | $ 2,250 | $ 2,265 | $ 3,803
Percentage of revenue by customer (in dollars per share) | 0.50% | 0.40% | 0.70%

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + 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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- Definition Percentage of revenue generated from a single external customer. + References No definition available. + Details
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