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Notes Payable (Details) | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) instrument | Oct. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) derivative | Dec. 31, 2016 USD ($) derivative | Oct. 31, 2015 USD ($) derivative | May 31, 2014 USD ($) derivative | Apr. 30, 2013 USD ($) derivative | Jul. 31, 2011 USD ($) derivative
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of derivative financial instruments outstanding | instrument | 0 |  |  |  |  |  |  |
Debt issuance costs incurred | $ 22,682,000 |  |  |  |  |  |  |
2021 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal | 300,000,000 |  |  |  |  |  |  |
Discount | 4,269,000 |  |  |  |  |  |  |
Net Price | $ 295,731,000 |  |  |  |  |  |  |
Stated Rate | 5.50% |  |  |  |  |  |  |
Effective Rate | 5.689% |  |  |  |  |  |  |
2021 Notes | Interest Rate Swap |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of derivative financial instruments outstanding | derivative |  |  |  |  |  |  |  | 2
Notional amount |  |  |  |  |  |  |  | $ 150,000,000
Liability amount from termination of hedge agreement |  |  |  |  |  |  |  | 5,300,000
Liability amount from termination of hedge agreement, comprehensive income |  |  |  |  |  |  |  | $ 5,218,000
2022 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal | $ 325,000,000 |  |  |  |  |  |  |
Discount | 4,989,000 |  |  |  |  |  |  |
Net Price | $ 320,011,000 |  |  |  |  |  |  |
Stated Rate | 3.80% |  |  |  |  |  |  |
Effective Rate | 3.985% |  |  |  |  |  |  |
2023 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal | $ 350,000,000 |  |  |  |  |  |  |
Discount | 2,594,000 |  |  |  |  |  |  |
Net Price | $ 347,406,000 |  |  |  |  |  |  |
Stated Rate | 3.30% |  |  |  |  |  |  |
Effective Rate | 3.388% |  |  |  |  |  |  |
2023 Notes | Forward Starting Swaps |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of derivative financial instruments outstanding | derivative |  |  |  |  |  |  | 4 |
Notional amount |  |  |  |  |  |  | $ 240,000,000 |
Liability amount from termination of hedge agreement |  |  |  |  |  |  | 3,156,000 |
Liability amount from termination of hedge agreement, comprehensive income |  |  |  |  |  |  | $ 3,141,000 |
2024 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal | $ 350,000,000 |  |  |  |  |  |  |
Discount | 707,000 |  |  |  |  |  |  |
Net Price | $ 349,293,000 |  |  |  |  |  |  |
Stated Rate | 3.90% |  |  |  |  |  |  |
Effective Rate | 3.924% |  |  |  |  |  |  |
2024 Notes | Forward Starting Swaps |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of derivative financial instruments outstanding | derivative |  |  |  |  |  | 3 |  |
Notional amount |  |  |  |  |  | $ 225,000,000 |  |
Liability amount from termination of hedge agreement |  |  |  |  |  | $ 6,312,000 |  |
2025 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal | $ 400,000,000 |  |  |  |  |  |  |
Discount | 964,000 |  |  |  |  |  |  |
Net Price | $ 399,036,000 |  |  |  |  |  |  |
Stated Rate | 4.00% |  |  |  |  |  |  |
Effective Rate | 4.029% |  |  |  |  |  |  |
2025 Notes | Forward Starting Swaps |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of derivative financial instruments outstanding | derivative |  |  |  |  | 4 |  |  |
Notional amount |  |  |  |  | $ 300,000,000 |  |  |
Liability amount from termination of hedge agreement |  |  |  |  | $ 13,369,000 |  |  |
2026 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal | $ 350,000,000 |  |  |  |  |  |  |
Discount | 3,860,000 |  |  |  |  |  |  |
Net Price | $ 346,140,000 |  |  |  |  |  |  |
Stated Rate | 3.60% |  |  |  |  |  |  |
Effective Rate | 3.733% |  |  |  |  |  |  |
2026 Notes | Forward Starting Swaps |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of derivative financial instruments outstanding | derivative |  |  |  | 2 |  |  |  |
Notional amount |  |  |  | $ 180,000,000 |  |  |  |
Liability amount from termination of hedge agreement |  |  |  | $ 13,345,000 |  |  |  |
2027 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal | $ 400,000,000 |  |  |  |  |  |  |
Discount | 1,628,000 |  |  |  |  |  |  |
Net Price | $ 398,372,000 |  |  |  |  |  |  |
Stated Rate | 3.50% |  |  |  |  |  |  |
Effective Rate | 3.548% |  |  |  |  |  |  |
2027 Notes | Forward Starting Swaps |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of derivative financial instruments outstanding | derivative |  |  | 2 |  |  |  |  |
Notional amount |  |  | $ 250,000,000 |  |  |  |  |
Liability amount from termination of hedge agreement |  |  | 7,690,000 |  |  |  |  |
Liability amount from termination of hedge agreement, comprehensive income |  |  | $ 7,688,000 |  |  |  |  |
2015 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal |  | $ 250,000,000 |  |  |  |  |  |
Stated Rate |  | 6.875% |  |  |  |  |  |

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