A company can pay dividends of 2.00 even it has net earnings of only 1.67 because it may have other sources of cash. It is tedious to study the annual report, but by doing so you can learn how the company's cash flow works.
For instance, depreciation taken by the company is recorded as a charge against income, even though no money is paid for this charge. So, on the balance sheets, the company subtracts the cost of depreciation from it earnings. However, the "cash" represented by this depreciation still remains available to the company and could for instance go toward dividend payment.
Look in the annual report for an item called "funds available for distribution" or some such. It is generally a number higher than the amount of the dividend.
Keep in mind that many MLPs including major propane companies are forced to borrow funds to pay the dividend. This is OK as long as next year they can pay it back. However, in some cases the share value drops if the financials get too shaky. You end up getting part of your share value returned as a dividend.