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Debt Credit Agreements (Details Textual) (Details) - USD ($) |  | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 19, 2018 | Dec. 31, 2019 | Feb. 27, 2020 | Feb. 26, 2020 | Feb. 25, 2020 | Jan. 31, 2020 | Oct. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Oct. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Secured debt, percentage of mortgages used as security |  | 80.00% |  |  |  |  |  |  |  |
Repay deficit in agreement, period |  | 6 months |  |  |  |  |  |  |  |
Deferred loan costs |  | $ 1,600,000 |  |  |  |  |  |  |  |
Borrowings under Credit Agreement |  | 255,000,000.0 |  |  |  |  |  |  | $ 40,000,000 |
Outstanding letters of credit |  | 46,100,000 |  |  |  |  |  |  |  |
Long-term line of credit |  | $ 288,000,000 |  |  |  |  |  |  | $ 220,000,000 |
Third Amended Credit Agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior secured revolving credit maximum facility |  |  |  |  |  |  |  |  |  | $ 850,000,000.0
Effective interest rate |  | 3.28% |  |  |  |  |  |  |  |
EBITDA ratio, debt outstanding, cash and cash equivalents limit |  | $ 50,000,000 |  |  |  |  |  |  |  |
Debt to EBITDA ratio covenant |  | 4.00 |  |  |  |  |  |  |  |
Third Amended Credit Agreement | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  | 0.375% |  |  |  |  |  |  |  |
Third Amended Credit Agreement | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  | 0.50% |  |  |  |  |  |  |  |
San Mateo Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Effective interest rate |  | 3.55% |  |  |  |  |  |  |  |
Eurodollar | Third Amended Credit Agreement | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Additional interest rate |  | 1.25% |  |  |  |  |  |  |  |
Eurodollar | Third Amended Credit Agreement | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Additional interest rate |  | 2.25% |  |  |  |  |  |  |  |
Federal Funds Effective Rate | Third Amended Credit Agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.50% |  |  |  |  |  |  |  |
Base Rate Loan | Third Amended Credit Agreement | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Additional interest rate |  | 1.25% |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior secured revolving credit maximum facility |  |  |  |  |  |  |  |  |  | $ 500,000,000.0
Line of Credit | San Mateo Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior secured revolving credit maximum facility | $ 250,000,000.0 |  |  |  |  |  | $ 375,000,000.0 | $ 325,000,000.0 |  |
Outstanding letters of credit |  | $ 16,200,000 |  |  |  |  |  |  |  |
Accordian feature, increase limit | $ 400,000,000.0 |  |  |  |  |  |  |  |  |
Deferred loan costs |  | 2,700,000 |  |  |  |  |  |  |  |
Long-term line of credit |  | $ 288,000,000.0 |  |  |  |  |  |  |  |
Line of Credit | San Mateo Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Commitment fee percentage | 0.30% |  |  |  |  |  |  |  |  |
Line of Credit | San Mateo Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Commitment fee percentage | 0.50% |  |  |  |  |  |  |  |  |
Libor Rate | Third Amended Credit Agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.00% |  |  |  |  |  |  |  |
Base Rate Loan | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Additional interest rate |  | 0.25% |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior secured revolving credit maximum facility |  |  | $ 700,000,000.0 |  |  | $ 500,000,000.0 |  |  |  |
Borrowings under Credit Agreement |  |  |  | $ 255,000,000 | $ 255,000,000.0 |  |  |  |  |
Outstanding letters of credit |  |  |  |  | $ 46,000,000.0 |  |  |  |  |
Subsequent Event | Third Amended Credit Agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity, amended |  |  | 1,500,000,000 |  |  |  |  |  |  |
Subsequent Event | Revolving Credit Facility | Third Amended Credit Agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility, Maximum Borrowing Capacity, Increase In Borrowing Base |  |  | $ 900,000,000.0 |  |  |  |  |  |  |
Subsequent Event | Line of Credit | San Mateo Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  | 16,200,000 |  |  |  |  |  |
Long-term line of credit |  |  |  | $ 288,000,000 |  |  |  |  |  |
Federal Funds Effective Rate | Line of Credit | San Mateo Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.50% |  |  |  |  |  |  |  |  |
Adjusted LIBO Rate | Line of Credit | San Mateo Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.00% |  |  |  |  |  |  |  |  |
Adjusted LIBO Rate | Line of Credit | San Mateo Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Additional interest rate | 0.50% |  |  |  |  |  |  |  |  |
Adjusted LIBO Rate | Line of Credit | San Mateo Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Additional interest rate | 1.50% |  |  |  |  |  |  |  |  |
Statutory Reserve Rate | Line of Credit | San Mateo Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Additional interest rate | 1.50% |  |  |  |  |  |  |  |  |
Statutory Reserve Rate | Line of Credit | San Mateo Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Additional interest rate | 2.50% |  |  |  |  |  |  |  |  |
The Bank Of Nova Scotia | San Mateo Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt to EBITDA ratio covenant | 5.00 |  |  |  |  |  |  |  |  |
Interest coverage ratio | 2.50 |  |  |  |  |  |  |  |  |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section S45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68176171&loc=SL68176184-208336 + 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=119400593&loc=d3e572229-122910 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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