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Notes Payable (Details) | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2015 USD ($) instrument | Oct. 31, 2015 USD ($) derivative | Jun. 30, 2014 USD ($) | May. 31, 2014 USD ($) derivative | Apr. 30, 2013 USD ($) derivative | Jul. 31, 2011 USD ($) derivative | Sep. 30, 2007 USD ($)
Notes Payable [Line Items] |  |  |  |  |  |  |
Number of derivative financial instruments outstanding | instrument | 0 |  |  |  |  |  |
Debt Issuance Costs Incurred | $ 17,782,000 |  |  |  |  |  |
Interest Rate Swap |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | $ 100,000,000
Liability amount from termination of hedge agreement |  |  |  |  |  |  | 3,260,000
Liability amount from termination of hedge agreement, comprehensive income |  |  |  |  |  |  | 3,228,000
2017 Notes |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |
Principal | 250,000,000 |  |  |  |  |  |
Discount | 877,000 |  |  |  |  |  |
Net Price | $ 249,123,000 |  |  |  |  |  |
Stated Rate | 6.875% |  |  |  |  |  |
Effective Rate | 6.924% |  |  |  |  |  |
2017 Notes | Interest Rate Swap |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | 100,000,000
Liability amount from termination of hedge agreement |  |  |  |  |  |  | 3,260,000
Liability amount from termination of hedge agreement, comprehensive income |  |  |  |  |  |  | $ 3,228,000
2021 Notes |  |  |  |  |  |  |
Notes Payable [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 |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |
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 |
Number of derivative financial instruments outstanding | derivative |  |  |  |  |  | 2 |
2022 Notes |  |  |  |  |  |  |
Notes Payable [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 |  |  |  |  |  |  |
Notes Payable [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 |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |
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 |  |
Number of derivative financial instruments outstanding | derivative |  |  |  |  | 4 |  |
2024 Notes |  |  |  |  |  |  |
Notes Payable [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 |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |
Notional amount |  |  |  | $ 225,000,000 |  |  |
Liability amount from termination of hedge agreement |  |  |  | $ 6,312,000 |  |  |
Number of derivative financial instruments outstanding | derivative |  |  |  | 3 |  |  |
2025 Notes |  |  |  |  |  |  |
Notes Payable [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 |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |
Notional amount |  | $ 300,000 |  |  |  |  |
Liability amount from termination of hedge agreement |  | $ 13,369,000 |  |  |  |  |
Number of derivative financial instruments outstanding | derivative |  | 4 |  |  |  |  |
2014 Notes |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |
Principal |  |  | $ 150,000,000 |  |  |  |
Stated Rate |  |  | 6.25% |  |  |  |
2015 Notes |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |
Principal | $ 150,000,000 |  |  |  |  |  |
Stated Rate | 6.15% |  |  |  |  |  |

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