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REVOLVING CREDIT FACILITY AND UNSECURED TERM LOANS (Details) |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 15, 2017 USD ($) | Nov. 15, 2017 USD ($) | Apr. 06, 2017 USD ($) | Apr. 04, 2017 USD ($) | Jun. 20, 2011 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Apr. 22, 2015 USD ($)
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |  |
Loan procurement costs capitalized |  |  |  |  |  | $ 21,400,000 | $ 24,700,000 |
Loan procurement costs, net of amortization |  |  |  |  |  | 1,592,000 | 2,150,000 |
Interest rate (as a percent) | 4.375% |  |  |  |  |  |  |
Unsecured term loan |  |  |  |  |  | 299,396,000 | 398,749,000 |
Less: Loan procurement costs, net |  |  |  |  |  | (1,592,000) | (2,150,000) |
Term Loan Facility | Minimum |  |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |  |
Tangible net worth |  |  |  |  |  | $ 821,211,200 |  |
Term Loan Facility | Maximum |  |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |  |
Percentage of funds from operations that can be distributed on common shares |  |  |  |  |  | 95.00% |  |
Term Loan Facility | Term Loan |  |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  |  | 3.05% |  |
Term Loan Facility | Term Loan A |  |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 100,000,000 |  |  |
Term of debt instrument |  |  |  |  | 5 years |  |  |
Write off of unamortized cost |  |  | $ 200,000 |  |  |  |  |
Repayment of outstanding debt |  |  | $ 100,000,000 |  |  |  |  |
Unsecured term loan |  |  |  |  |  |  | 100,000,000 |
Term Loan Facility | Term Loan A | Baa2/BBB | LIBOR |  |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  |  |  | 1.30% |  |
Term Loan Facility | Term Loan B |  |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 100,000,000 |  |  |
Term of debt instrument |  |  |  |  | 7 years |  |  |
Unsecured term loan |  |  |  |  |  | $ 100,000,000 | 100,000,000 |
Effective interest rate (as a percent) |  |  |  |  |  | 3.62% |  |
Term Loan Facility | Term Loan B | Baa2/BBB | LIBOR |  |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  |  |  | 1.15% |  |
Credit Facility |  |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |  |
Loan procurement costs, net of amortization |  |  |  |  |  | $ 604,000 | 1,251,000 |
Unsecured term loan |  |  |  |  |  | 300,000,000 | 400,000,000 |
Less: Loan procurement costs, net |  |  |  |  |  | (604,000) | (1,251,000) |
Total unsecured term loans, net |  |  |  |  |  | $ 299,396,000 | 398,749,000 |
Net proceeds from equity issuances added to minimum tangible net worth (as a percent) |  |  |  |  |  | 75.00% |  |
Credit Facility | Minimum |  |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |  |
Fixed charge coverage ratio |  |  |  |  |  | 1.50 |  |
Credit Facility | Maximum |  |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |  |
Total indebtedness to total asset value ratio (as a percent) |  |  |  |  |  | 60.00% |  |
Credit Facility | Revolver |  |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 500,000,000
Interest rate, basis spread (as a percent) |  |  |  |  |  | 1.25% |  |
Facility fee (as a percent) |  |  |  |  |  | 0.15% |  |
Remaining borrowing capacity |  |  |  |  |  | $ 417,600,000 |  |
Outstanding letter of credit |  |  |  |  |  | 700,000 |  |
Credit Facility | Unsecured term loan |  |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |  |
Unsecured term loan |  |  |  |  |  | $ 200,000,000 | $ 200,000,000 |
Effective interest rate (as a percent) |  |  |  |  |  | 2.86% |  |
Senior notes 4.375% due 2023 |  |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |  |
Proceeds from senior notes | $ 250,000,000 |  |  | $ 50,000,000 |  |  |  |
Interest rate (as a percent) |  |  |  | 4.375% |  | 4.375% | 4.375% |
Effective interest rate (as a percent) |  |  |  |  |  | 4.33% |  |
Effective weighted average interest rate (as a percent) | 4.501% |  |  | 3.495% |  | 4.33% |  |
Senior notes 4.000% due 2025 |  |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |  |
Proceeds from senior notes |  | $ 250,000,000 |  | $ 50,000,000 |  |  |  |
Interest rate (as a percent) |  | 4.00% |  | 4.00% |  | 4.00% | 4.00% |
Effective interest rate (as a percent) |  | 4.032% |  | 3.811% |  | 3.99% |  |
Effective weighted average interest rate (as a percent) |  |  |  |  |  | 3.994% |  |

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