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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Examination |  |  |
Federal income taxes receivable | $ 12,700 |  |
State and Local income taxes receivable | 400 |  |
Federal, State and Local income taxes receivable |  | $ 8,100 |
State income taxes payable |  | 400 |
Excess tax benefits on stock-based compensation | 7,983 | 9,028 | $ 3,914
Remaining available pool of excess tax benefits from prior stock option exercises | 31,500 |  |
Accrued interest and penalties related to taxes | 200 | 200 | 200
Unrecognized tax benefits, net of federal income tax benefits | $ 2,900 | $ 2,700 | $ 1,200
Indiana |  |  |
Income Tax Examination |  |  |
Percentage of operating located in Indiana | 80.00% |  |

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- Definition Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6419406&loc=d3e23524-113945 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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