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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Operating activities: |  |  |
Net income | $ 74,042 | $ 39,812 | $ 29,472
Adjustments to reconcile net income to cash provided by operating activities: |  |  |
Increase in accrued interest receivable | (10,464) | (6,504) | (1,522)
(Decrease) increase in accrued interest payable | 730 | 1,086 | (129)
Provision for loan losses | 192 | 871 | 1,379
Marketable Securities, Realized Gain (Loss) | 8,461 | 2,096 | 2,891
Loss on non-recourse collateralized financing | 0 | 1,970 | (561)
Fair value adjustments, net | 173 | 676 | (294)
Amortization and depreciation | 90,530 | 32,505 | 6,180
Stock-based compensation expense | 1,828 | 917 | 626
Cash paid for stock appreciation rights | (116) | (134) | (420)
Net change in other assets and other liabilities | 934 | 1,538 | (1,769)
Net cash and cash equivalents provided by operating activities | 149,388 | 70,641 | 30,071
Investing activities: |  |  |
Purchase of investments | (2,639,909) | (1,606,819) | (1,112,804)
Principal payments received on investments | 682,817 | 478,488 | 315,709
Increase in principal receivable on investments | (3,182) | (10,087) | 168
Proceeds from sales of investments | 231,145 | 184,688 | 56,585
Principal payments received on securitized mortgage loans | 40,830 | 37,556 | 54,977
Other investing activities | (2,893) | 419 | (297)
Net cash and cash equivalents used in investing activities | (1,691,192) | (915,755) | (685,662)
Financing activities: |  |  |
Borrowings under repurchase agreements, net | 1,470,995 | 859,610 | 595,854
Deferred borrowing costs paid | (825) | 0 | 0
Borrowings under non-recourse collateralized financing | 0 | 0 | 50,678
Principal payments on non-recourse collateralized financing | (40,626) | (15,296) | (43,829)
Cash paid to redeem securitization financing bonds | 0 | (23,669) | (56,406)
Proceeds from issuance of preferred stock | 55,407 | 0 | 0
Proceeds from issuance of stock | 123,868 | 95,282 | 116,850
Cash paid for common stock repurchase | (921) | 0 | 0
Dividends paid | (59,061) | (40,873) | (18,893)
Net cash and cash equivalents provided by financing activities | 1,548,837 | 875,054 | 644,254
Net increase in cash and cash equivalents | 7,033 | 29,940 | (11,337)
Cash and cash equivalents at beginning of period | 48,776 | 18,836 | 30,173
Cash and cash equivalents at end of period | 55,809 | 48,776 | 18,836
Supplemental Disclosure of Cash Activities: |  |  |
Cash paid for interest | $ 34,035 | $ 22,110 | $ 14,568

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