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Debt and Credit Agreements - 2016 Senior Secured Credit Facility (Details) - USD ($)				12 Months Ended			24 Months Ended
	Apr. 03, 2017	Dec. 02, 2016	Jan. 05, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Apr. 11, 2017	Jan. 06, 2016
Debt Instrument [Line Items]
Interest expense				$ 6,300,000	$ 5,300,000	$ 0
Wells Fargo Bank, National Association
Debt Instrument [Line Items]
Proceeds from debt				59,000,000
Repayment of debt and revolving credit facility				102,500,000			$ 137,000,000
Debt issuance cost, Amended Credit Agreement				2,106,000
Total Debt, net of deferred issuance cost				210,125,000	254,141,000		210,125,000
Carrying amount of debt				217,000,000	260,500,000		217,000,000
Long-term debt, fair value				220,900,000			220,900,000
Secured Credit Facility | Wells Fargo Bank, National Association | Line of Credit
Debt Instrument [Line Items]
Revolving credit facility			$ 400,000,000
Annual capital expenditure limitation per Credit Agreement			35,000,000					$ 45,000,000
Maximum allowed non-permitted investments per Credit Agreement			$ 10,000,000					$ 20,000,000
Debt issuance cost				$ 10,100,000			10,100,000
Secured Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Interest Rate Option One | LIBOR | Minimum
Debt Instrument [Line Items]
Amounts draw under the Credit Agreements bears interest rate			1.50%
Secured Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Interest Rate Option One | LIBOR | Maximum
Debt Instrument [Line Items]
Amounts draw under the Credit Agreements bears interest rate			2.25%
Secured Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Interest Rate Option Two | LIBOR | Minimum
Debt Instrument [Line Items]
Amounts draw under the Credit Agreements bears interest rate			0.50%
Secured Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Interest Rate Option Two | LIBOR | Maximum
Debt Instrument [Line Items]
Amounts draw under the Credit Agreements bears interest rate			1.25%
Secured Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Interest Rate Option Two | Federal Funds
Debt Instrument [Line Items]
Amounts draw under the Credit Agreements bears interest rate			0.50%
Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, term (in years)				5 years
Revolving Credit Facility | Wells Fargo Bank, National Association
Debt Instrument [Line Items]
Proceeds from debt				$ 59,000,000
Repayment of debt and revolving credit facility				92,500,000
Carrying amount of debt				$ 34,500,000	68,000,000		34,500,000
Revolving Credit Facility | Wells Fargo Bank, National Association | Line of Credit
Debt Instrument [Line Items]
Revolving credit facility			$ 200,000,000						$ 315,000,000
Debt instrument, term (in years)			5 years
Proceeds from debt	$ 59,000,000		$ 55,000,000
Revolving Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Minimum
Debt Instrument [Line Items]
Commitment fee percentage, unused capacity			0.20%
Revolving Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Maximum
Debt Instrument [Line Items]
Commitment fee percentage, unused capacity			0.35%
Term Loan Facility
Debt Instrument [Line Items]
Debt instrument, term (in years)				5 years
Term Loan Facility | Wells Fargo Bank, National Association
Debt Instrument [Line Items]
Proceeds from debt				$ 0
Repayment of debt and revolving credit facility				10,000,000
Carrying amount of debt				$ 182,500,000	$ 192,500,000		$ 182,500,000
Term Loan Facility | Wells Fargo Bank, National Association | Line of Credit
Debt Instrument [Line Items]
Revolving credit facility			$ 200,000,000
Debt instrument, term (in years)			5 years
Periodic payment, principal percent years one and two			5.00%
Periodic payment, principal percent years three and four			10.00%
Periodic payment, principal percent year five			15.00%
Proceeds from debt		$ 40,000,000	$ 200,000,000
Letter of Credit | Wells Fargo Bank, National Association
Debt Instrument [Line Items]
Revolving credit facility			$ 10,000,000
Letter of Credit | Wells Fargo Bank, National Association | Line of Credit | Minimum
Debt Instrument [Line Items]
Commitment fee percentage			1.50%
Letter of Credit | Wells Fargo Bank, National Association | Line of Credit | Maximum
Debt Instrument [Line Items]
Commitment fee percentage			2.25%
Bridge Loan [Member] | Wells Fargo Bank, National Association
Debt Instrument [Line Items]
Revolving credit facility			$ 10,000,000

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- Definition

Annual capital expenditure limitation per Credit Agreement

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Long-term Line of Credit, Gross

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Proceeds from Long-term Lines of Credit, Finance Costs

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

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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- 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.

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- 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.

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- Definition

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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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.

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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