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Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance |  |  | $ 694,210 | $ 488,912
Balance, shares |  |  | 35,613,351 |
Net earnings/(loss) | 28,143 | 8,005 | 40,184 | 3,251
Exercise of stock options |  |  | 10,916 | 1,222
Exercise of stock options, shares | 199,827 | 10,600 | 322,100 | 79,300
Equity award compensation expense |  |  | 3,941 | 3,273
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation |  |  | 1,687 |
Issuance of stock, value |  |  | 0 | 0
non-controlling interest acquisition |  |  | (257) |
Balance | 750,681 | 496,658 | 750,681 | 496,658
Balance, shares | 36,216,251 |  | 36,216,251 |
Common Stock [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance |  |  | 356 | 404
Balance, shares |  |  | 35,613,000 | 40,377,000
Net earnings/(loss) |  |  | 0 | 0
Exercise of stock options |  |  | 3 | 1
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net |  |  | 0 |
Exercise of stock options, shares |  |  | 322,000 | 79,000
Equity award compensation expense |  |  | 0 | 0
Issuance of stock, shares |  |  | 281,000 | 197,000
Issuance of stock, value |  |  | 3 | 2
non-controlling interest acquisition |  |  | 0 |
Balance | 362 | 407 | 362 | 407
Balance, shares | 36,216,000 | 40,653,000 | 36,216,000 | 40,653,000
Additional Paid In Capital [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance |  |  | 390,249 | 478,839
Net earnings/(loss) |  |  | 0 | 0
Exercise of stock options |  |  | 10,913 | 1,221
Equity award compensation expense |  |  | 3,941 | 3,273
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation |  |  | 1,687 |
Issuance of stock, value |  |  | (3) | (2)
non-controlling interest acquisition |  |  | (257) |
Balance | 406,530 | 483,331 | 406,530 | 483,331
Retained Earnings [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance |  |  | 303,605 | 198,442
Net earnings/(loss) |  |  | 40,184 | 3,251
Exercise of stock options |  |  |  | 0
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures |  |  | 0 |
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net |  |  | 0 |
Equity award compensation expense |  |  | 0 | 0
Issuance of stock, value |  |  | 0 | 0
non-controlling interest acquisition |  |  | 0 |
Balance | 343,789 | 201,693 | 343,789 | 201,693
Treasury Stock [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance |  |  |  | (188,773)
Net earnings/(loss) |  |  |  | 0
Exercise of stock options |  |  |  | 0
Equity award compensation expense |  |  |  | 0
Issuance of stock, value |  |  |  | 0
Balance |  | $ (188,773) |  | $ (188,773)

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