Debt - Convertible Notes - Narrative (Details)
|
Jun. 30, 2017
USD ($)
|
May 31, 2014
USD ($)
$ / shares
|
Dec. 31, 2016
USD ($)
|
| Debt Instrument [Line Items] |
|
|
|
| Unamortized deferred financing costs |
$ 33,132,000
|
|
$ 37,111,000
|
| Convertible Senior Notes |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Conversion rate |
0.0770592
|
0.0763636
|
|
| Conversion price (in USD per share) | $ / shares |
|
$ 13.10
|
|
| Premium above public offering price (as a percent) |
|
22.50%
|
|
| Anti-dilutive cash dividends, exceeding (in USD per share) | $ / shares |
|
$ 0.16625
|
|
| Debt discount, value of the embedded conversion premium |
$ 28,600,000
|
$ 56,700,000
|
33,500,000
|
| Unamortized deferred financing costs |
$ 9,700,000
|
19,600,000
|
$ 11,400,000
|
| Convertible Senior Notes | Convertible Senior Notes Due 2019 |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Aggregate principal amount of debt |
|
$ 402,500,000.0
|
|
| Stated interest rate |
|
2.875%
|
|
| Convertible Senior Notes | Convertible Senior Notes Due 2021 |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Aggregate principal amount of debt |
|
$ 345,000,000.0
|
|
| Stated interest rate |
|
3.75%
|
|