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Employee Benefits (Employee Benefit Plans) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employee benefit costs | $ 16,112 | $ 9,694 | $ 5,849
401(k) Matching [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
401(k) matching | 2,267 | 815 | 700
Deferred Bonus Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Bonus plan costs | 445 | 406 | 467
Production Bonus Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Bonus plan costs |  | 373 | 582
Health Benefits, Including Premiums [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Health benefits, including premiums | $ 13,400 | $ 8,100 | $ 4,100

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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Amount, after effect of policies assumed or ceded, of expense related to provision for policy benefits and costs incurred for health insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.5) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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