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Bank and Other Notes Payable - Narrative (Details) - USD ($) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 23, 2015 | Mar. 29, 2013 | Dec. 08, 2011 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Bank and other notes payable |  |  |  |  |  |
Deferred finance cost |  |  |  | $ (17,838,000) | $ (12,716,000) |
Loss on extinguishment of debt | $ 578,000 |  |  | 0 | (1,709,000) | $ (1,487,000)
Line of Credit |  |  |  |  |  |
Bank and other notes payable |  |  |  |  |  |
Line of credit |  |  |  | $ 1,500,000,000 |  |
Extension option term |  |  |  | 1 year |  |
Maximum contingent borrowing capacity |  |  |  | $ 2,000,000,000 |  |
Line of credit |  |  |  | 935,000,000 | 885,000,000 |
Deferred finance cost |  |  |  | $ (7,548,000) | $ (10,039,000) |
Average interest rate (as a percent) |  |  |  | 3.13% | 2.40% |
Line of Credit | Level 2 |  |  |  |  |  |
Bank and other notes payable |  |  |  |  |  |
Fair value of line of credit |  |  |  | $ 919,158,000 | $ 865,921,000 |
Line of Credit | LIBOR |  |  |  |  |  |
Bank and other notes payable |  |  |  |  |  |
Variable interest rate spread (as a percent) |  |  |  | 1.45% |  |
Line of Credit | LIBOR | Low end of range |  |  |  |  |  |
Bank and other notes payable |  |  |  |  |  |
Variable interest rate spread (as a percent) |  |  |  | 1.30% |  |
Line of Credit | LIBOR | High end of range |  |  |  |  |  |
Bank and other notes payable |  |  |  |  |  |
Variable interest rate spread (as a percent) |  |  |  | 1.90% |  |
Term Loan |  |  |  |  |  |
Bank and other notes payable |  |  |  |  |  |
Debt issued |  |  | $ 125,000,000 |  |  |
Term Loan | LIBOR | Low end of range |  |  |  |  |  |
Bank and other notes payable |  |  |  |  |  |
Variable interest rate spread (as a percent) |  |  | 1.95% |  |  |
Term Loan | LIBOR | High end of range |  |  |  |  |  |
Bank and other notes payable |  |  |  |  |  |
Variable interest rate spread (as a percent) |  |  | 3.20% |  |  |
Prasada Note |  |  |  |  |  |
Bank and other notes payable |  |  |  |  |  |
Debt issued |  | $ 13,330,000 |  |  |  |
Interest rate on debt (as a percent) |  | 5.25% |  |  |  |
Carrying value of term loan |  |  |  | $ 4,732,000 | 5,521,000 |
Estimated fair value of term loan |  |  |  | $ 4,717,000 | $ 5,786,000 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of 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 FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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 FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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