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Revolving Credit Facility and Long-Term Debt - Narrative (Details) - USD ($)		3 Months Ended
	Mar. 14, 2018	Mar. 31, 2018	Dec. 31, 2017	Dec. 13, 2017	Jul. 06, 2016
Line of Credit Facility [Line Items]
Collateralized debt facility	$ 7,000,000	$ 6,983,000	$ 6,959,000
Variable rate on loan		2.85%
Outstanding borrowings		$ 386,983,000
LIBOR
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	1.00%
Credit Agreement
Line of Credit Facility [Line Items]
Outstanding borrowings		380,000,000
Remaining borrowing capacity on line of credit		76,900,000
Fixed interest rate percent			2.68%
Debt subject to fixed interest rate		$ 175,000,000	$ 175,000,000
Credit Agreement | Variable Rate 1
Line of Credit Facility [Line Items]
Variable interest rate percent		3.14%	2.82%
Debt subject to variable interest rate		$ 205,000,000	$ 97,000,000
Credit Agreement | Interest Rate Swap 2
Line of Credit Facility [Line Items]
Fixed interest rate percent		2.37%
Revolving Credit Facility | Credit Agreement
Line of Credit Facility [Line Items]
Increase to revolving credit commitment				$ 100,000,000
Maximum borrowing capacity				$ 375,000,000
Interest rate increase if in event of default		2.00%
Revolving Credit Facility | Credit Agreement | Minimum
Line of Credit Facility [Line Items]
Commitment fee percentage		0.15%
Revolving Credit Facility | Credit Agreement | Maximum
Line of Credit Facility [Line Items]
Commitment fee percentage		0.40%
Term Loan | Credit Agreement
Line of Credit Facility [Line Items]
Debt instrument, face amount					$ 150,000,000
Bridge Loan | Credit Agreement
Line of Credit Facility [Line Items]
Maximum borrowing capacity					$ 25,000,000

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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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Face (par) amount of debt instrument at time of issuance.

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-SubTopic 30
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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.

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

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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