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Notes Payable (Schedule of Long-term Debt) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |
Liabilities fair value |  | $ 320,785 | $ 301,785
Notes Payable |  | $ 320,000 | 290,000
Bank Of America [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 0.40% |
Union Bank [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 0.40% |
Level 2 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Liabilities fair value |  | $ 320,765 | 301,525
Level 2 [Member] | Secured Notes One [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Secured loan |  | 120,000 | 120,000
Level 2 [Member] | Secured Notes Two [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Secured loan |  | 20,000 | 20,000
Unsecured Debt [Member] | Borrowings [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Liabilities fair value |  | 180,000 | 150,000
Unsecured Debt [Member] | Borrowings [Member] | Level 2 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Liabilities fair value | [1] | $ 180,000 | $ 150,000
[1] | On July 2, 2013, the Company entered into an unsecured $200 million five-year revolving credit facility, which later was expanded to a borrowing capacity of $250 million. The interest rate on borrowings under the credit facility is based on the Company's debt to total capital ratio and ranges from LIBOR plus 112.5 basis points when the ratio is under 15% to LIBOR plus 162.5 basis points when the ratio is above 25%. Commitment fees for the undrawn portions of the credit facility range from 12.5 basis points when the ratio is under 15% to 22.5 basis points when the ratio is above 25%. Debt to capital ratio is expressed as a percentage of (a) consolidated debt to (b) consolidated shareholders' equity plus consolidated debt. In 2016, the interest rate was LIBOR plus 112.5 basis points on the $180 million of borrowings and 12.5 basis points on the undrawn portion of the credit facility. The interest rate was approximately 1.73% at December 31, 2016.

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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + 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(a)(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 Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: 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 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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