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Long-Term Debt (Notes) | 12 Months Ended
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Dec. 31, 2015
Debt Disclosure [Abstract] |
Line of Credit and Long Term Debt | Long-Term Debt On November 11, 2013, we entered into a Credit Agreement with Wells Fargo Bank, National Association, (the “Bank”). Pursuant to the Credit Agreement, the Bank provided a five-year, $250.0 million unsecured revolving line of credit, which was used to assist in the repayment of all debt acquired at the time of acquisition, and which may be used for future working capital, equipment financing, and general corporate purposes. The Bank's commitment decreased to $200.0 million on November 1, 2015, and will decrease to $175.0 million on November 1, 2016 through October 31, 2018. The Credit Agreement is unsecured, with a negative pledge against all assets of our consolidated group, except for debt associated with permitted acquisitions, new purchase-money debt and capital lease obligations as described in the Credit Agreement. The Credit Agreement matures on October 31, 2018, subject to the ability of Heartland Express, Inc. of Iowa (the “Borrower”) to terminate the commitment at any time at no additional cost to the Borrower. Borrowings under the Credit Agreement can either be, at the Borrower's election, (i) one-month or three-month LIBOR (Index) plus 0.625%, floating, or (ii) Prime (Index) plus 0%, floating. The weighted average variable annual percentage rate is not calculated since no amounts borrowed and outstanding at December 31, 2015. There is a commitment fee on the unused portion of the line of credit under the Credit Agreement at 0.0625%, due monthly. The Credit Agreement contains customary financial covenants including, but not limited to, (i) a maximum adjusted leverage ratio of 2:1, measured quarterly, (ii) required minimum net income of $1.00, measured quarterly, (iii) required minimum tangible net worth of $200 million, measured quarterly, and (iv) limitations on other indebtedness and liens. The Credit Agreement also includes customary events of default, conditions, representations and warranties, and indemnification provisions. We were in compliance with the respective financial covenants at December 31, 2015. Long term debt consisted of the following at December 31 (in thousands):
|  | December 31, 2015 |  | December 31, 2014
Long-term debt |  | $ | — |  |  | $ | 24,600 |
The weighted average variable annual percentage rate (“APR”) for amounts borrowed and outstanding at December 31, 2014 was 0.787%. Borrowing under the line of credit is recorded in “Long-term debt” in the consolidated balance sheets. Outstanding letters of credit associated with the revolving line of credit at December 31, 2015 were $4.7 million compared to $4.4 million at December 31, 2014. As of December 31, 2015, the line of credit available for future borrowing was $195.3 million compared to $196.0 million at December 31, 2014.

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- Definition The entire disclosure for long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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