|
Fair Value of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified |
Jun. 30, 2012
|
Dec. 31, 2011
|
|---|---|---|
|
Carrying Amount [Member]
|
||
| Fair values and related carrying values of debt instruments | ||
| Total | $ 427,148 | $ 425,000 |
|
Fair Value [Member]
|
||
| Fair values and related carrying values of debt instruments | ||
| Total | 451,573 | 438,204 |
|
9.125% Senior Notes, due April 2018 (issued March 22,2010) [Member] | Carrying Amount [Member]
|
||
| Fair values and related carrying values of debt instruments | ||
| Total | 300,000 | 300,000 |
|
9.125% Senior Notes, due April 2018 (issued March 22,2010) [Member] | Fair Value [Member]
|
||
| Fair values and related carrying values of debt instruments | ||
| Total | 317,250 | 315,000 |
|
9.125% Senior Notes, due April 2018 (issued April 25,2012) [Member] | Carrying Amount [Member]
|
||
| Fair values and related carrying values of debt instruments | ||
| Total | 125,000 | |
|
9.125% Senior Notes, due April 2018 (issued April 25,2012) [Member] | Fair Value [Member]
|
||
| Fair values and related carrying values of debt instruments | ||
| Total | 132,188 | |
|
2.125% Convertible Senior Notes [Member] | Carrying Amount [Member]
|
||
| Fair values and related carrying values of debt instruments | ||
| Total | 2,148 | 125,000 |
|
2.125% Convertible Senior Notes [Member] | Fair Value [Member]
|
||
| Fair values and related carrying values of debt instruments | ||
| Total | $ 2,136 | $ 123,204 |