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Note 17 - Quarterly Results of Operations (Unaudited) (Details) - Quarterly Results of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Results of Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 206,788 us-gaap_Revenues |  | $ 177,581 us-gaap_Revenues | [1] | $ 173,654 us-gaap_Revenues |  | $ 160,957 us-gaap_Revenues |  | $ 176,487 us-gaap_Revenues | $ 170,843 us-gaap_Revenues | $ 172,488 us-gaap_Revenues | $ 164,731 us-gaap_Revenues | [2] | $ 718,980 us-gaap_Revenues | $ 684,549 us-gaap_Revenues | $ 674,254 us-gaap_Revenues
Operating income | 24,650 us-gaap_OperatingIncomeLoss |  | 5,586 us-gaap_OperatingIncomeLoss | [1] | 9,056 us-gaap_OperatingIncomeLoss |  | 354 us-gaap_OperatingIncomeLoss |  | 8,877 us-gaap_OperatingIncomeLoss | 5,882 us-gaap_OperatingIncomeLoss | 6,350 us-gaap_OperatingIncomeLoss | (715)us-gaap_OperatingIncomeLoss | [2] | 39,646 us-gaap_OperatingIncomeLoss | 20,394 us-gaap_OperatingIncomeLoss | 23,209 us-gaap_OperatingIncomeLoss
Net income (loss) | $ 13,545 us-gaap_NetIncomeLoss |  | $ 1,857 us-gaap_NetIncomeLoss | [1] | $ 3,780 us-gaap_NetIncomeLoss |  | $ (1,374)us-gaap_NetIncomeLoss |  | $ 3,339 us-gaap_NetIncomeLoss | $ 1,973 us-gaap_NetIncomeLoss | $ 1,891 us-gaap_NetIncomeLoss | $ (1,959)us-gaap_NetIncomeLoss | [2] | $ 17,808 us-gaap_NetIncomeLoss | $ 5,244 us-gaap_NetIncomeLoss | $ 6,065 us-gaap_NetIncomeLoss
Basic and diluted (loss) income per share (in Dollars per share) |  |  |  |  |  |  |  |  | $ 0.22 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.13 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.13 us-gaap_EarningsPerShareBasicAndDiluted | $ (0.13)us-gaap_EarningsPerShareBasicAndDiluted | [2] |  |  |
Basic (loss) income per share (1) (in Dollars per share) | $ 0.84 us-gaap_EarningsPerShareBasic | [3] | $ 0.12 us-gaap_EarningsPerShareBasic | [1],[3] | $ 0.25 us-gaap_EarningsPerShareBasic | [3] | $ (0.09)us-gaap_EarningsPerShareBasic | [3] |  |  |  |  |  | $ 1.17 us-gaap_EarningsPerShareBasic | $ 0.35 us-gaap_EarningsPerShareBasic | $ 0.41 us-gaap_EarningsPerShareBasic
Diluted (loss) income per share (1) (in Dollars per share) | $ 0.82 us-gaap_EarningsPerShareDiluted | [3] | $ 0.12 us-gaap_EarningsPerShareDiluted | [1],[3] | $ 0.25 us-gaap_EarningsPerShareDiluted | [3] | $ (0.09)us-gaap_EarningsPerShareDiluted | [3] |  |  |  |  |  | $ 1.15 us-gaap_EarningsPerShareDiluted | $ 0.35 us-gaap_EarningsPerShareDiluted | $ 0.41 us-gaap_EarningsPerShareDiluted
[1] | Includes $7.5 million increase to claims reserves for a 2008 cargo claim.
[2] | Includes $2.4 million gain on the sale of a terminal property.
[3] | Quarter totals do not aggregate to annual results due to the dilution related to the follow-on stock offering.

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