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REVOLVING CREDIT FACILITY AND UNSECURED TERM LOANS (Details) |  |  |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 22, 2015 USD ($) | Apr. 21, 2015 USD ($) | Dec. 17, 2013 USD ($) | Jun. 20, 2011 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 09, 2011 USD ($)
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Loan procurement costs, net of amortization |  |  |  |  | $ 2,038,000 | $ 2,150,000 |
Unsecured term loan borrowings outstanding |  |  |  |  | 398,890,000 | 398,749,000 |
Term Loan Facility |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Loan procurement costs, net of amortization |  |  |  |  | $ 1,100,000 | $ 1,300,000 |
Net proceeds from equity issuances added to minimum tangible net worth (as a percent) |  |  |  |  | 75.00% |  |
Term Loan Facility | Minimum |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Fixed charge coverage ratio |  |  |  |  | 1.50 |  |
Tangible net worth |  |  |  |  | $ 821,211,200 |  |
Term Loan Facility | Maximum |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Total indebtedness to total asset value ratio (as a percent) |  |  |  |  | 60.00% |  |
Percentage of funds from operations that can be distributed on common shares |  |  |  |  | 95.00% |  |
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 |  |  |
Term Loan Facility | Term Loan A | Baa2/BBB |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  |  | 1.30% |  |
Variable interest rate basis |  |  |  |  | LIBOR |  |
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 |  |  |
Term Loan Facility | Term Loan B | Baa2/BBB |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  |  | 1.15% |  |
Variable interest rate basis |  |  |  |  | LIBOR |  |
Term Loan Facility | Unsecured term loan |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Unsecured term loan borrowings outstanding |  |  |  |  | $ 200,000,000 |  |
Credit Facility |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Effective weighted average interest rate (as a percent) |  |  |  |  | 2.57% |  |
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 |  |
Tangible net worth |  |  |  |  | $ 821,211,200 |  |
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% |  |
Percentage of funds from operations that can be distributed on common shares |  |  |  |  | 95.00% |  |
Credit Facility | Revolver |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Maximum borrowing capacity | $ 500,000,000 | $ 300,000,000 |  |  |  |  | $ 300,000,000
Interest rate, basis spread (as a percent) |  |  |  |  | 1.25% |  |
Variable interest rate basis |  |  |  |  | LIBOR |  |
Facility fee (as a percent) | 0.15% | 0.20% |  |  | 0.15% |  |
Remaining borrowing capacity |  |  |  |  | $ 446,300,000 |  |
Outstanding letter of credit |  |  |  |  | $ 700,000 |  |
Credit Facility | Term Loan C |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | 100,000,000
Repayment of outstanding debt |  |  | $ 100,000,000 |  |  |  |
Credit Facility | Term Loan D |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 200,000,000
Interest rate, basis spread (as a percent) |  |  |  |  | 1.30% |  |
Credit Facility | Unsecured term loan |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Unsecured term loan borrowings outstanding |  |  |  |  | $ 200,000,000 |  |

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