Convertible Subordinated Notes Convertible Subordinated Notes (Narrative) (Details) (Details)
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3 Months Ended |
6 Months Ended |
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Jun. 30, 2018
USD ($)
$ / shares
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May 31, 2018
USD ($)
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May 07, 2018
USD ($)
shares
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Mar. 19, 2014
USD ($)
$ / shares
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Jun. 30, 2018
USD ($)
$ / shares
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Jun. 30, 2017
USD ($)
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Jun. 30, 2018
USD ($)
$ / shares
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Jun. 30, 2017
USD ($)
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Dec. 31, 2017
USD ($)
$ / shares
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| Debt Instrument [Line Items] |
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| Common Stock, Par or Stated Value Per Share | $ / shares |
$ 0.01
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$ 0.01
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$ 0.01
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$ 0.01
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| Interest Expense, Debt |
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$ 1,900,000
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| Amortization of Debt Issuance Costs |
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320,000
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$ 408,000
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| Write off of Deferred Debt Issuance Cost |
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$ 700,000
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| Gain (Loss) on Repurchase of Debt Instrument |
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845,000
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0
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| Interest Expense |
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$ 4,743,000
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$ 3,206,000
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8,478,000
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6,235,000
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| Payments for Repurchase of Redeemable Convertible Preferred Stock |
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75,229,000
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0
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| Convertible Subordinated Notes [Member] |
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| Debt Instrument [Line Items] |
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| Convertible Preferred Stock, Shares Issued upon Conversion | shares |
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2,822,859
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| Convertible subordinated notes, principal amount |
$ 28,764,000
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$ 115,000,000
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$ 143,750,000
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$ 28,764,000
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$ 28,764,000
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$ 143,750,000
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| Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |
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80.00%
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| Stated interest rate percentage |
2.75%
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2.75%
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2.75%
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2.75%
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| Gain (Loss) On Repurchase Of Convertible Junior Subordinated Debentures |
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$ 1,200,000
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| Gain (Loss) on Extinguishment of Debt, before Write off of Debt Issuance Cost |
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2,500,000
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| Debt Instrument, Convertible, Conversion Ratio |
44.7976
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44.3169
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| Long-term Debt, Fair Value |
$ 34,300,000
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$ 34,300,000
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$ 34,300,000
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| Interest Expense, Debt |
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500,000
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1,000,000
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1,500,000
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2,000,000
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| Amortization of Debt Issuance Costs |
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100,000
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100,000
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200,000
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300,000
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| Accretion of discount, convertible subordinated notes |
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$ 600,000
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$ 1,100,000
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$ 1,700,000
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$ 2,100,000
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| Debt instrument, convertible, conversion price (in dollars per share) | $ / shares |
$ 22.32
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$ 22.56
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$ 22.32
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$ 22.32
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| Effective interest rate percentage |
3.15%
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3.15%
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11.36%
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3.15%
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11.36%
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| Write off of Deferred Debt Issuance Cost |
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1,300,000
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$ 700,000
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$ 700,000
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| Gain (Loss) on Repurchase of Debt Instrument |
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800,000
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| Component of Convertible Debt, Transaction Expense, Early Extinguishment |
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500,000
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| Payments for Repurchase of Redeemable Convertible Preferred Stock, Principle |
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74,800,000
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| Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt |
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300,000
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| Interest Expense |
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400,000
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| Payments for Repurchase of Redeemable Convertible Preferred Stock |
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$ 75,200,000
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