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Long Term Debt (Narrative) (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 04, 2016 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |
Loss on early extinguishment of debt |  | $ 300,000 | $ 254,000 | $ 0 | $ 0
Long-term debt outstanding |  |  | $ 498,490,000 | 270,810,000 |
Interest rate at period end (percent) |  |  | 2.77% |  |
Debt Instrument, Financing Costs Expensed |  | $ 2,700,000 | $ 2,700,000 |  |
Amended and Restated Senior Credit Agreement [Member] | Eurodollar [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (percent) | 2.00% |  |  |  |
Amended and Restated Senior Credit Agreement [Member] | Base Rate [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (percent) | 1.00% |  |  |  |
Revolving Line of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt outstanding |  |  | 329,000,000 | 265,609,000 |
Line of credit facility, available borrowing capacity |  |  | 191,200,000 |  |
Revolving Line of Credit [Member] | Amended and Restated Senior Credit Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity | $ 525,000,000.0 |  |  |  |
Letters of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Letters of credit outstanding |  |  | 4,800,000 |  |
Term Loan Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross |  |  | 166,300,000 |  |
Long-term debt outstanding |  |  | 165,628,000 | 0 |
Term Loan Facility [Member] | Amended and Restated Senior Credit Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount | $ 175,000,000.0 |  |  |  |
Mortgages Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt outstanding |  |  | $ 3,862,000 | $ 5,201,000 |
Debt interest rate (percent) |  |  | 8.25% |  |

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- Definition 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)) -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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