Debt Instrument, Derivative Instrument Basis Fixed Rate

No definition available.

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- Definition

The loss amount to be reimbursed per a contract

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
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Period Type:	instant

- Definition

Amount of assets pledged to secure a debt instrument.

+ References

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-Publisher FASB
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+ Details

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Period Type:	instant

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

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Balance Type:	credit
Period Type:	instant

- 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
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+ Details

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Balance Type:	na
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ 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.

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+ Details

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Balance Type:	credit
Period Type:	instant

- 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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Balance Type:	na
Period Type:	duration

- Definition

Amount of increase (decrease) of the credit facility.

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-Topic 235
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Balance Type:	credit
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Weighted average interest rate of long-term debt outstanding calculated at point in time.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	srt_RangeAxis=srt_MaximumMember
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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_MortgagesMember
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Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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- Details

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Balance Type:
Period Type:

- Details

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Period Type:

- Details

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Balance Type:
Period Type:

- Details

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Balance Type:
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- Details

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- Details

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- Details

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- Details

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Debt - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended	12 Months Ended
Debt - Narrative (Details) - USD ($) $ in Thousands	Jul. 31, 2018	Sep. 30, 2019	Dec. 31, 2018	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Aug. 31, 2017	Dec. 31, 2016	Aug. 31, 2016	Jul. 31, 2016	May 31, 2015	Nov. 18, 2014
Debt Instrument [Line Items]
Long-term Debt, Total		$ 931,867
Long-term Debt, Gross		931,900
Long-term Line of Credit		248,000	$ 19,000
Maximum [Member]
Debt Instrument [Line Items]
Reimbursement Agreement, Amount													$ 14,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 248,000
Long-term Debt, Weighted Average Interest Rate		3.30%	3.38%
Debt Instrument, Description of Variable Rate Basis		Borrowings under the revolving credit facility bear interest at LIBOR plus 85 to 155 basis points, depending on its credit rating. Additionally, the Company is required to pay a facility fee at an annual rate of 0 to 55 basis points of the total amount of the revolving credit facility, depending on its credit rating.
Line of Credit Facility, Maximum Borrowing Capacity	$ 325,000						$ 250,000		$ 350,000
Long-term Line of Credit		$ 248,000	$ 19,000
Line of Credit Facility, Increase (Decrease), Net	75,000
Line of Credit Facility, Remaining Borrowing Capacity		$ 77,000
Revolving Credit Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Credit facility fee (as a percent)		0.00%
Revolving Credit Facility [Member] \| Minimum [Member] \| LIBOR
Debt Instrument [Line Items]
Spread on variable rate		0.85%
Revolving Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 500,000
Credit facility fee (as a percent)		0.55%
Revolving Credit Facility [Member] \| Maximum [Member] \| LIBOR
Debt Instrument [Line Items]
Spread on variable rate		1.55%
Mortgages [Member]
Debt Instrument [Line Items]
Long-term Debt, Total		$ 58,423	60,926
Long-term Debt, Gross		58,867	$ 61,519
Debt Instrument, Collateral Amount		$ 89,700
Long-term Debt, Weighted Average Interest Rate		4.02%	4.13%
Unsecured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Total		$ 237,984	$ 256,419
Long-term Debt, Gross		$ 240,000	258,543
Unsecured Debt [Member] \| 2025 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.16%
Unsecured Debt [Member] \| 2027 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.26%
Debt Instrument, Face Amount												$ 50,000
Unsecured Debt [Member] \| 2028 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.42%
Unsecured Debt [Member] \| 2029 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.19%
Unsecured Debt [Member] \| 2030 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 125,000
Unsecured Debt [Member] \| 2019 Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross			18,543
Debt Instrument, Description of Variable Rate Basis		Borrowings under the 2019 Term Loan were priced at LIBOR plus 170 basis points. In order to fix LIBOR on the 2019 Term Loan at 1.92% until maturity, the Company had an interest rate swap agreement in place, which was assigned by the lender under the Mortgage Note to the 2019 Term Loan lender
Debt Instrument, Derivative Instrument Basis Fixed Rate		1.92%
Debt Instrument, Interest Rate, Effective Percentage		3.62%
Debt Instrument, Face Amount										$ 20,300
Unsecured Debt [Member] \| 2019 Term Loan [Member] \| LIBOR
Debt Instrument [Line Items]
Spread on variable rate		1.70%
Unsecured Debt [Member] \| 2023 Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 40,000	40,000
Debt Instrument, Description of Variable Rate Basis		Borrowings under the 2023 Term Loan are priced at LIBOR plus 85 to 165 basis points, depending on its credit rating. The Company entered into an interest rate swap to fix LIBOR at 140 basis points until maturity
Debt Instrument, Interest Rate, Effective Percentage		2.40%
Debt Instrument, Face Amount											$ 40,000
Unsecured Debt [Member] \| 2023 Term Loan [Member] \| LIBOR
Debt Instrument [Line Items]
Debt Instrument, Derivative Instrument Basis Fixed Rate		1.40%
Unsecured Debt [Member] \| 2023 Term Loan [Member] \| Minimum [Member] \| LIBOR
Debt Instrument [Line Items]
Spread on variable rate		0.85%
Unsecured Debt [Member] \| 2023 Term Loan [Member] \| Maximum [Member] \| LIBOR
Debt Instrument [Line Items]
Spread on variable rate		1.65%
Unsecured Debt [Member] \| 2024 Term Loan Facility One [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis		Borrowings under the unsecured 2024 Term Loan Facilities bear interest at a variable LIBOR plus 85 to 165 basis points, depending on its credit rating. The Company utilized existing interest rate swaps to effectively fix the LIBOR at 213 basis points until September 2020 ($35 million facility) and July 2021 ($65 million facility) (refer to Note 7 – Derivative Instruments and Hedging Activity).
Debt Instrument, Face Amount	65,000
Long-term Line of Credit	65,000
Unsecured Debt [Member] \| 2024 Term Loan Facility Two [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	35,000
Long-term Line of Credit	$ 35,000
Unsecured Debt [Member] \| 2024 Term Loans [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 100,000	100,000
Debt Instrument, Interest Rate, Effective Percentage		3.13%
Unsecured Debt [Member] \| 2024 Term Loans [Member] \| LIBOR
Debt Instrument [Line Items]
Debt Instrument, Derivative Instrument Basis Fixed Rate		2.13%
Unsecured Debt [Member] \| 2024 Term Loans [Member] \| Minimum [Member] \| LIBOR
Debt Instrument [Line Items]
Spread on variable rate		0.85%
Unsecured Debt [Member] \| 2024 Term Loans [Member] \| Maximum [Member] \| LIBOR
Debt Instrument [Line Items]
Spread on variable rate		1.65%
Unsecured Debt [Member] \| 2026 Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 100,000	$ 100,000
Debt Instrument, Description of Variable Rate Basis			Borrowings under the 2026 Term Loan are priced at LIBOR plus 145 to 240 basis points, depending on its credit rating. The Company entered into an interest rate swap to fix LIBOR at 266 basis points until maturity.
Debt Instrument, Interest Rate, Effective Percentage			4.26%
Debt Instrument, Face Amount			$ 100,000
Senior Unsecured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Total		384,171	384,064
Long-term Debt, Gross		385,000	385,000
Debt Instrument, Face Amount												100,000
Senior Unsecured Debt [Member] \| Interest Rate Swap Agreement Five [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 100,000
Senior Unsecured Debt [Member] \| Interest Rate Swap Agreement Six [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				4.41%
Debt Instrument, Face Amount				$ 100,000
Senior Unsecured Debt [Member] \| 2025 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		50,000	50,000
Debt Instrument, Face Amount												$ 50,000
Senior Unsecured Debt [Member] \| 2027 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		50,000	50,000
Senior Unsecured Debt [Member] \| 2028 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		60,000	60,000
Debt Instrument, Face Amount											$ 60,000
Senior Unsecured Debt [Member] \| 2029 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		100,000	100,000
Debt Instrument, Face Amount								$ 100,000
Senior Unsecured Debt [Member] \| 2030 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 125,000	$ 125,000
Debt Instrument, Interest Rate, Stated Percentage		4.32%
Senior Unsecured Debt [Member] \| 2031 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				4.47%
Debt Instrument, Face Amount				$ 125,000
Senior Unsecured Debt [Member] \| 2031 Senior Unsecured Notes [Member] \| Interest Rate Swap Agreement Six [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage				4.42%
Debt Instrument, Face Amount				$ 125,000