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Debt Senior Notes (Details) $ / shares in Units, shares in Millions | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) $ / shares shares | Jan. 15, 2021 | Jan. 14, 2020 | Jan. 14, 2019 | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 9.75% |  |  |  |
Restricted Payments Basket | $ 137,700,000 |  |  |  | $ 128,500,000
2021 Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount | $ 300,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.75% |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  | 100.00% | 101.688% | 103.375% |
2017 Convertible Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Convertible senior subordinated notes | $ 57,500,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.25% |  |  |  |
Debt Instrument, Convertible, Conversion Ratio | 42.0159 |  |  |  |
Debt Instrument Convertible Principal Amount Used In Conversion Rate Calculation | $ 1,000 |  |  |  |
Debt Instrument, Convertible, Conversion Price | $ / shares | $ 23.80 |  |  |  |
Stock Issued During Period, Shares, Other | shares | 2.4 |  |  |  |
2018 Convertible Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Convertible senior subordinated notes | $ 86,250,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.00% |  |  |  |
Debt Instrument, Convertible, Conversion Ratio | 30.9478 |  |  |  |
Debt Instrument Convertible Principal Amount Used In Conversion Rate Calculation | $ 1,000 |  |  |  |
Debt Instrument, Convertible, Conversion Price | $ / shares | $ 32.31 |  |  |  |
Stock Issued During Period, Shares, Other | shares | 2.7 |  |  |  |
Base of restricted payments basket income calculation [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Other Restrictions on Payment of Dividends | $ 125,000,000 |  |  |  |
Percentage of our aggregate consolidated net income added to base amount of calculation [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent restrictions on payment of dividends | 50.00% |  |  |  |
Percentage of our aggregate consolidated net income subtracted from base amount of calculation [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent restrictions on payment of dividends | 100.00% |  |  |  |
Percentage of net cash proceeds from sale of qualified equity interests added to base and income/loss amount in calculation [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent restrictions on payment of dividends | 100.00% |  |  |  |

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