XML 33 R18.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Deferred Costs | 6 Months Ended
--- | ---
Jun. 30, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |
Deferred Costs | Deferred Costs Deferred costs at June 30, 2018 and December 31, 2017 consisted of the following (in thousands):
| June 30, 2018 |  | December 31, 2017
Deferred leasing costs | $ | 426,875 |  |  | $ | 443,341 |
Less: accumulated amortization | (227,934 | ) |  | (217,140 | )
Deferred costs, net | $ | 198,941 |  |  | $ | 226,201 |

X
- Definition Costs incurred in connection with financing activities (fees to banks) and costs incurred in connection with leasing activities (fees to real estate brokers), net of amortization. + References No definition available. + Details
Name: | slg_DeferredFinancingAndLeasingCostsDisclosureTextBlock
Namespace Prefix: | slg_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration