Derivative Instruments (Narrative) (Details) $ in Millions	3 Months Ended
Mar. 31, 2019 USD ($) Derivative
Derivatives Fair Value [Line Items]
Net losses expected to be reclassified into earnings in the next twelve months	$ 1.1
Interest Rate Swaps [Member] \| Cash Flow Hedging [Member]
Derivatives Fair Value [Line Items]
Number of interest rate swap agreements \| Derivative	5
Interest Rate Swaps [Member] \| Cash Flow Hedging [Member] \| Minimum [Member]
Derivatives Fair Value [Line Items]
Swaps fixed interest rate	3.88%
LIBOR variable interest rate	1.85%
Interest Rate Swaps [Member] \| Cash Flow Hedging [Member] \| Maximum [Member]
Derivatives Fair Value [Line Items]
Swaps fixed interest rate	4.82%
LIBOR variable interest rate	2.15%
Interest Rate Swaps [Member] \| Cash Flow Hedging [Member] \| Term Loans [Member]
Derivatives Fair Value [Line Items]
Term loan debt	$ 357.5

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
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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
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-Name Accounting Standards Codification
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- Definition

The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

+ References

No definition available.

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

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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

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- Definition

Number of interest rate derivative instruments held by the entity at the reporting date.

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