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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2015
Summary of Significant Accounting Policies [Abstract] |
Costs and Estimated Earnings in Excess of Billings |
| As of December 31,
(in thousands) | 2015 |  | 2014
Claims | $ | 407,164 |  | $ | 311,949
Unapproved change orders |  | 270,019 |  |  | 161,375
Other unbilled costs and profits |  | 227,992 |  |  | 253,078
Total costs and estimated earnings in excess of billings | $ | 905,175 |  | $ | 726,402
Calculations of Basic and Diluted EPS |
| Year Ended December 31,
(in thousands, except per share data) | 2015 |  | 2014 |  | 2013
Net income | $ | 45,292 |  | $ | 107,936 |  | $ | 87,296
Weighted-average common shares outstanding - basic |  | 48,981 |  |  | 48,562 |  |  | 47,851
Effect of diluted stock options and unvested restricted stock |  | 685 |  |  | 552 |  |  | 738
Weighted-average common shares outstanding - diluted |  | 49,666 |  |  | 49,114 |  |  | 48,589
Net income (loss) per share: |  |  |  |  |  |  |  |
Basic | $ | 0.92 |  | $ | 2.22 |  | $ | 1.82
Diluted | $ | 0.91 |  | $ | 2.20 |  | $ | 1.80
Anti-dilutive securities not included above |  | 1,372 |  |  | 9 |  |  | 860
Cash and Cash Equivalents and Restricted Cash |
| As of December 31,
(in thousands) | 2015 |  | 2014
Cash and cash equivalents | $ | 18,409 |  | $ | 40,846
Company's share of joint venture cash and cash equivalents |  | 57,043 |  |  | 94,737
Total cash and cash equivalents | $ | 75,452 |  | $ | 135,583
Restricted cash | $ | 45,853 |  | $ | 44,370
Tax Effects of Componenets of Other Comprehensive Income (Loss) |
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
(in thousands) | Before-Tax Amount |  | Tax (Expense) Benefit |  | Net-of-Tax Amount |  | Before-Tax Amount |  | Tax (Expense) Benefit |  | Net-of-Tax Amount |  | Before-Tax Amount |  | Tax (Expense) Benefit |  | Net-of-Tax Amount
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined benefit pension plan adjustments | $ | 31 |  | $ | 1,995 |  | $ | 2,026 |  | $ | (13,887) |  | $ | 5,732 |  | $ | (8,155) |  | $ | 18,675 |  | $ | (7,765) |  | $ | 10,910
Foreign currency translation adjustment |  | (5,897) |  |  | 2,683 |  |  | (3,214) |  |  | (1,086) |  |  | 448 |  |  | (638) |  |  | (1,212) |  |  | 474 |  |  | (738)
Unrealized gain (loss) in fair value of investments |  | 1,123 |  |  | (357) |  |  | 766 |  |  | 346 |  |  | (141) |  |  | 205 |  |  | (744) |  |  | 189 |  |  | (555)
Unrealized gain (loss) in fair value of interest rate swap |  | (37) |  |  | (88) |  |  | (125) |  |  | 594 |  |  | (245) |  |  | 349 |  |  | 948 |  |  | (370) |  |  | 578
Total other comprehensive income (loss) | $ | (4,780) |  | $ | 4,233 |  | $ | (547) |  | $ | (14,033) |  | $ | 5,794 |  | $ | (8,239) |  | $ | 17,667 |  | $ | (7,472) |  | $ | 10,195
Changes in AOCI Balances by Component |
(in thousands) | Defined Benefit Pension Plan |  | Foreign Currency Translation |  | Unrealized Gain (Loss) in Fair Value of Investments |  | Unrealized Gain (Loss) in Fair Value of Interest Rate Swap |  | Accumulated Other Comprehensive Income (Loss), Net
Balance as of December 31, 2012 | $ | (43,023) |  | $ | (13) |  | $ | 240 |  | $ | (778) |  | $ | (43,574)
Other comprehensive income (loss) |  | 10,910 |  |  | (738) |  |  | (555) |  |  | 578 |  |  | 10,195
Balance as of December 31, 2013 | $ | (32,113) |  | $ | (751) |  | $ | (315) |  | $ | (200) |  | $ | (33,379)
Other comprehensive income (loss) |  | (8,155) |  |  | (638) |  |  | 205 |  |  | 349 |  |  | (8,239)
Balance as of December 31, 2014 | $ | (40,268) |  | $ | (1,389) |  | $ | (110) |  | $ | 149 |  | $ | (41,618)
Other comprehensive income (loss) |  | 2,026 |  |  | (3,214) |  |  | 766 |  |  | (125) |  |  | (547)
Balance as of December 31, 2015 | $ | (38,242) |  | $ | (4,603) |  | $ | 656 |  | $ | 24 |  | $ | (42,165)
(1) There were no reclassifications from AOCI during the three years ended December 31, 2015.

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