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Summary of Significant Accounting Policies Summary of Significant Accounting Policies:Interest Rate Risk and Interest Rate Swaps (Details) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended		12 Months Ended
	Dec. 31, 2016	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2016	Dec. 31, 2017	Mar. 31, 2016	Feb. 16, 2016
Interest Rate Derivatives [Line Items]
Long-term debt		$ 438,870			$ 438,312
Repayments of Term Debt		7,500	$ 366,400
Term Loans Due 2022 and 2026 [Member]
Interest Rate Derivatives [Line Items]
Long-term debt		95,000			95,000
Debt Instrument, Face Amount		125,000
Term Loan Due 2026 [Member]
Interest Rate Derivatives [Line Items]
Repayments of Term Debt	$ 30,000			$ 30,000
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | Level 2 [Member] | Other assets [Member]
Interest Rate Derivatives [Line Items]
Fair value of interest rate swap agreements, Asset		$ 6,900			$ 4,700
Interest Rate Swap - $50 million notional amount fixed at 1.007% [Member] | Not Designated as Hedging Instrument [Member]
Interest Rate Derivatives [Line Items]
Interest rate swaps, notional amount							$ 50,000
Interest rate swaps, fixed interest rate							1.007%
Interest Rate Swap - $75 million notional amount fixed at 1.256% [Member] | Not Designated as Hedging Instrument [Member]
Interest Rate Derivatives [Line Items]
Interest rate swaps, notional amount						$ 75,000
Interest rate swaps, fixed interest rate						1.256%

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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-SubTopic 10
-Section 50
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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