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Long-term debt (Details) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 12, 2016 shares $ / shares | Dec. 11, 2013 USD ($) Unit | Jan. 29, 2014 USD ($) shares $ / shares | Sep. 30, 2014 | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Long-Term Debt [Line Items] |  |  |  |  |  |  |
Proceeds from borrowings on long-term indebtedness |  |  |  |  | $ 0 | $ 2,000 | $ 1,000
Payments on borrowings on long-term indebtedness |  |  |  |  | $ 0 | 0 | $ 62,000
BAML Revolving Credit Facility [Memeber] |  |  |  |  |  |  |
Long-Term Debt [Line Items] |  |  |  |  |  |  |
Maturity date |  | Dec. 11, 2018 |  |  |  |  |
Maximum borrowing capacity |  | $ 100,000 |  |  |  |  |
Credit Agreement [Member] |  |  |  |  |  |  |
Long-Term Debt [Line Items] |  |  |  |  |  |  |
Number of lending institutions | Unit |  | 3 |  |  |  |  |
Debt covenant, consolidated debt service coverage ratio, minimum |  |  |  |  | 2.50 |  |
Debt covenant, leverage ratio, maximum |  |  |  | 4.00 | 3.50 |  | 3.75
Debt covenant, minimum cash and liquid investments balance |  |  |  |  | $ 50,000 |  |
2.875% Convertible Senior Notes Due 2021 [Member] |  |  |  |  |  |  |
Long-Term Debt [Line Items] |  |  |  |  |  |  |
Face amount of debt instrument |  |  | $ 250,000 |  |  |  |
Interest rate percentage |  |  | 2.875% |  |  |  |
Maturity date |  |  | Jan. 15, 2021 |  |  |  |
Conversion rate of notes per $1,000 principal amount (in shares) | shares | 32.3860 |  | 30.8821 |  |  |  |
Conversion price per share (in dollars per share) | $ / shares | $ 30.88 |  | $ 32.38 |  |  |  |
Debt issuance costs |  |  | $ 8,300 |  |  |  |
BAML Term Loan [Member] |  |  |  |  |  |  |
Long-Term Debt [Line Items] |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  | $ 1,800
Amount of debt issuance costs in other assets, netted against long term debt [Member] |  |  |  |  |  |  |
Long-Term Debt [Line Items] |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  | 4,900 |
Amount of debt issuance costs in prepaid and other current assets, netted against long term debt [Member] |  |  |  |  |  |  |
Long-Term Debt [Line Items] |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  | $ 1,200 |

X
- Definition A debt coverage ration required to be maintained under a debt covenant agreement. The debt coverage ratio is calculated by dividing earnings before interest, taxes, depreciation and amortization for the most recent four quarters less cash taxes by the sum of current obligations and interest expense for borrowed money, in each case due and payable following four quarters. + References No definition available. + Details
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- Definition Maximum leverage ratio required to be maintained under a debt covenant agreement. A leverage ratio is calculated by dividing the funded debt by earnings before interest, taxes, depreciation and amortization for the most recent four quarters. + References No definition available. + Details
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- Definition Minimum cash and liquid investments balance required in order to be in compliance with the covenant clauses of the debt agreement. + References No definition available. + Details
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- Definition The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity. + References No definition available. + Details
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- Definition Number of lending institutions in which the entity has a credit facility. + References No definition available. + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 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 Contractual interest rate for funds borrowed, under the debt 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References No definition available. + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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. + 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 cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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