Inventory (Summary of Interests in Land Option Agreements) (Details) - USD ($) $ in Thousands |
Mar. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Variable Interest Entity [Line Items] | ||
| Deposits and Pre-acquisition Costs | $ 183,031 | $ 162,119 |
| Remaining Purchase Price | 2,287,112 | 2,046,193 |
| Land options with VIEs | ||
| Variable Interest Entity [Line Items] | ||
| Deposits and Pre-acquisition Costs | 91,777 | 77,641 |
| Remaining Purchase Price | 1,152,369 | 1,064,506 |
| Other Land Option Agreements Member | ||
| Variable Interest Entity [Line Items] | ||
| Deposits and Pre-acquisition Costs | 91,254 | 84,478 |
| Remaining Purchase Price | $ 1,134,743 | $ 981,687 |