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Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Cash and cash equivalents and restricted cash and cash equivalents |  |  |  |
Cash | $ 9,095 | $ 4,560 |  |
Money Market Funds | 473,781 | 342,832 |  |
Cash and cash equivalents | 482,876 | 347,392 | 325,968 | 229,685
Cash and cash Equivalents, % by Institution | 100.00% | 100.00% |  |
Restricted cash and cash equivalents | 2,653 | 33,009 |  |
Restricted cash and cash equivalents, % by Institution | 100.00% | 100.00% |  |
Funds held in Trust [Member] |  |  |  |
Cash and cash equivalents and restricted cash and cash equivalents |  |  |  |
Restricted cash and cash equivalents | 53 |  |  |
State Deposits [Member] |  |  |  |
Cash and cash equivalents and restricted cash and cash equivalents |  |  |  |
Restricted cash and cash equivalents | 2,600 | 33,009 |  |
U .S. Bank IT&C [Member] |  |  |  |
Cash and cash equivalents and restricted cash and cash equivalents |  |  |  |
Money Market Funds |  | 40,463 |  |
Cash and cash equivalents |  | 40,463 |  |
Cash and cash Equivalents, % by Institution |  | 11.60% |  |
Restricted cash and cash equivalents | 800 | 800 |  |
Restricted cash and cash equivalents, % by Institution | 30.20% | 2.40% |  |
U .S. Bank IT&C [Member] | Funds held in Trust [Member] |  |  |  |
Cash and cash equivalents and restricted cash and cash equivalents |  |  |  |
Restricted cash and cash equivalents |  |  |  |
U .S. Bank IT&C [Member] | State Deposits [Member] |  |  |  |
Cash and cash equivalents and restricted cash and cash equivalents |  |  |  |
Restricted cash and cash equivalents | 800 | 800 |  |
Sun Trust Bank [Member] |  |  |  |
Cash and cash equivalents and restricted cash and cash equivalents |  |  |  |
Cash | 4,996 | 773 |  |
Money Market Funds | 14,292 | 1,055 |  |
Cash and cash equivalents | 19,288 | 1,828 |  |
Cash and cash Equivalents, % by Institution | 4.00% | 0.50% |  |
Sun Trust Bank Escrow Services [Member] |  |  |  |
Cash and cash equivalents and restricted cash and cash equivalents |  |  |  |
Money Market Funds | 449,928 | 300,843 |  |
Cash and cash equivalents | 449,928 | 300,843 |  |
Cash and cash Equivalents, % by Institution | 93.10% | 86.60% |  |
Wells Fargo Bank N.A. [Member] |  |  |  |
Cash and cash equivalents and restricted cash and cash equivalents |  |  |  |
Cash | 3,666 | 1,991 |  |
Money Market Funds |  | 3 |  |
Cash and cash equivalents | 3,666 | 1,994 |  |
Cash and cash Equivalents, % by Institution | 0.80% | 0.60% |  |
Bank of New York Mellon Trust Co. [Member] |  |  |  |
Cash and cash equivalents and restricted cash and cash equivalents |  |  |  |
Restricted cash and cash equivalents | 53 |  |  |
Restricted cash and cash equivalents, % by Institution | 2.00% |  |  |
Bank of New York Mellon Trust Co. [Member] | Funds held in Trust [Member] |  |  |  |
Cash and cash equivalents and restricted cash and cash equivalents |  |  |  |
Restricted cash and cash equivalents | 53 |  |  |
Florida Department of Financial Services [Member] |  |  |  |
Cash and cash equivalents and restricted cash and cash equivalents |  |  |  |
Restricted cash and cash equivalents | 1,800 | 32,209 |  |
Restricted cash and cash equivalents, % by Institution | 67.80% | 97.60% |  |
Florida Department of Financial Services [Member] | Funds held in Trust [Member] |  |  |  |
Cash and cash equivalents and restricted cash and cash equivalents |  |  |  |
Restricted cash and cash equivalents |  |  |  |
Florida Department of Financial Services [Member] | State Deposits [Member] |  |  |  |
Cash and cash equivalents and restricted cash and cash equivalents |  |  |  |
Restricted cash and cash equivalents | 1,800 | 32,209 |  |
Deutsche Bank Securities, Inc. [Member] |  |  |  |
Cash and cash equivalents and restricted cash and cash equivalents |  |  |  |
Cash | 433 | 1,796 |  |
Money Market Funds | 9,561 | 468 |  |
Cash and cash equivalents | $ 9,994 | $ 2,264 |  |
Cash and cash Equivalents, % by Institution | 2.10% | 0.70% |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3044-108585 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 + Details
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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 80 -Subparagraph Exhibit 4-8, 3 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 + Details
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