Debt Interest Rate Risk Management (Details) - USD ($)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	$ 553,000,000	$ 712,000,000
Debt instrument, effective interest rate	2.978%	2.655%
Accumulated other comprehensive income (loss)	$ 91,000	$ 190,000
Derivative Asset	91,000
Gain (Loss) Recognized in the Next Twelve Months, Net	91,000
Derivative Assets (Liabilities), at Fair Value, Net		190,000
Cash Flow Hedging [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	150,000,000
Interest Rate Swap [Member] \| Cash Flow Hedging [Member]
Debt Instrument [Line Items]
Accumulated other comprehensive income (loss)	91,000
Interest Rate Swap [Member] \| Cash Flow Hedging, Added 2012 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	$ 150,000,000
Long-term debt, fixed interest rate	0.74%
Debt Instrument, Basis Spread on Variable Rate	2.25%
Debt instrument, effective interest rate	2.99%
Other Long-term Liabilities [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedging [Member]
Debt Instrument [Line Items]
Derivative Asset		(304,000)
Accumulated Other Comprehensive Income (Loss) [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedging [Member]
Debt Instrument [Line Items]
Derivative liabilities, fair value		114,000
Derivative Asset	$ 91,000	304,000
Other Current Assets [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedging [Member]
Debt Instrument [Line Items]
Derivative Asset	$ 91,000
Other Noncurrent Assets [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedging [Member]
Debt Instrument [Line Items]
Derivative liabilities, fair value		$ 114,000

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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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.

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

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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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.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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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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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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