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Employee Benefits (Narrative) (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 USD ($) employee | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Employee Benefits [Abstract] |  |  |
Employer matching contribution, percent of employees' pay | 100.00% |  |
Maximum annual contribution per employee, percent | 4.00% |  |
Participants in employee health plan | employee | 2,376 |  |
Health care cap per person | $ 200,000 |  |
Insured capped maximum exposure health care | 15,000,000 |  |
Workers' compensation liability | 4,600,000 | $ 2,800,000 | $ 1,300,000
Insured maximum exposure per employee | 1,000,000 |  |
Aggragate insurance deductable for employees | $ 4,000,000 |  |

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- Definition Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 + Details
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