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Long-Term Debt (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |
Senior Notes | $ 95,000 | $ 120,000
Letters of Credit | 9,975 | $ 12,317
Tranche A [Member] |  |
Debt Instrument [Line Items] |  |
Periodic principal payments | $ 50,000 |
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate | 4.00% |
Tranche B [Member] |  |
Debt Instrument [Line Items] |  |
Periodic principal payments | $ 45,000 |
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate | 4.79% |
Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Effective average interest rate | 4.37% | 4.68%
Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Interest Rate Spread added to variable rate | 0.00% |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.125% |
Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Interest Rate Spread added to variable rate | 0.50% |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.20% |
Sweep Program [Member] |  |
Debt Instrument [Line Items] |  |
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases | $ 30,000 |
Letter of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases | 100,000 |
Letters of Credit | 74,600 | $ 67,700
2015 Credit Agreement [Member] |  |
Debt Instrument [Line Items] |  |
LineOfCreditFacilityOriginalBorrowingCapacity | 250,000 |
Line Of Credit Facility Accordion | 100,000 |
Maximum borrowing capacity | $ 350,000 |
Interest Rate Spread added to variable rate | 1.00% | 1.00%
Letter Of Credit Fee In Percentage | 1.00% | 1.00%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.125% |
Accordion Feature Exercised During the Period Amount | $ 50,000 |
Line of Credit Facility, Current Borrowing Capacity | $ 300,000 |
2015 Credit Agreement [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.125%
2015 Credit Agreement [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.175%
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Interest Rate Spread added to variable rate | 1.00% |
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Interest Rate Spread added to variable rate | 1.50% |

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- Definition The amount of additional capacity under the revolving credit agreement added during the period under the accordion feature. + References No definition available. + Details
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- Definition Amount of original borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References No definition available. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition 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. + 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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